Dissertations / Theses: 'Stratigraphy'

1

Nakanishi, Takeshi. "Practical application of sequence stratigraphy and risk analysis for stratigraphic trap exploration." Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phn1635.pdf.

Full text

Abstract:

"September 2002" Includes bibliographical references (leaves 200-209) Outlines an evaluation procedure for stratigraphic trap exploration by employing sequence stratigraphy, 3D seismic data visualisation and quantitative risk analysis with case studies in an actual exploration basin.

APA, Harvard, Vancouver, ISO, and other styles

2

Nunes, Caio Oliveira. "Tectonic and stratigraphic evolution of southern Jacuípe basin based on seismic sequence stratigraphy." IGEO, 2018. http://repositorio.ufba.br/ri/handle/ri/26188.

Full text

Abstract:

Submitted by Everaldo Pereira (pereira.evera@gmail.com) on 2018-05-27T13:07:21Z No. of bitstreams: 1 Caio Dissertação Mestrado (Versão FINAL).pdf: 6456975 bytes, checksum: cb47f45f811eedcbb8b5288fd76f3f06 (MD5)
Approved for entry into archive by NUBIA OLIVEIRA (nubia.marilia@ufba.br) on 2018-06-18T18:15:34Z (GMT) No. of bitstreams: 1 Caio Dissertação Mestrado (Versão FINAL).pdf: 6456975 bytes, checksum: cb47f45f811eedcbb8b5288fd76f3f06 (MD5)
Made available in DSpace on 2018-06-18T18:15:34Z (GMT). No. of bitstreams: 1 Caio Dissertação Mestrado (Versão FINAL).pdf: 6456975 bytes, checksum: cb47f45f811eedcbb8b5288fd76f3f06 (MD5)
A Bacia de Jacuípe é considerada uma bacia de nova fronteira localizada no Nordeste Brasileiro, na margem passiva leste, e estritamente offshore. Acredita-se que ela tenha um grande potencial para jazidas de hidrocarbonetos. Entretanto, há uma grande carência em estudos integrados que auxiliem no seu entendimento. O presente trabalho visa compreender a história evolutiva da bacia através da interpretação de sequências de segunda e terceira ordens em dados de sísmica de reflexão. A partir da interpretação de 40 perfis sísmicos 2D e do único poço perfurado, que encontra-se na região de plataforma, os autores puderam caracterizar importantes eventos dentro da bacia. Dentro da supersequência rifte foram reconhecidas quatro sequências deposicionais nomeadas Rift 1, Rift 2, Rift 3 e Rift 4, limitadas por três limites de sequência. Os riftes 1 e 2 têm deposições isoladas ao longo da bacia e as falhas sintéticas e antitéticas destas fases começam um processo de conexão. O Rift 3 tem a maior representatividade na bacia e seus depósitos cobrem a maior parte dela. O Rift 4 representa o fim da subsidência mecânica com menores expressões nos falhamentos e experimentou um soerguimento, o qual levou a atual plataforma continental a ficar exposta durante eventos subsequentes. A supersequência Drift foi subdividida em dois estágios drifte. Uma vez que a bacia sofreu um soerguimento ao final do seu rifteamento, o primeiro estágio do drifte tem o preenchimento sedimentar confinado ao talude e ao sopé continental. Enquanto que no segundo estágio do drifte a sedimentação ultrapassa a falha de borda e seus depósitos se sobrepõem à supersequência rifte na plataforma. Um mapa estrutural de falhas foi construído para a porção sul da Bacia de Jacuípe destacando os principais controles do falhamento, a linha de charneira da bacia, principais depocentros, o Alto Externo de Jacuípe e um alto vulcânico. O limite geográfico a sul com a Bacia de Camamu foi definido em uma zona complexa de falhas de transferência e de alívio, caracterizando assim, um limite geológico. Adaptações foram sugeridas para uma nova carta cronoestratigráfica para a porção sul da Bacia de Jacuípe.
ABSTRACT Jacuípe Basin is considered a new frontier basin in the northeastern Brazilian passive margin. It is believed it has a great potential for hydrocarbon plays and leads. However, it lacks in integrated studies for its understanding. The present paper aims to comprehend the evolutionary history of such basin through seismic reflection analysis of second and third orders sequences. With the interpretation of several 2-D seismic profiles and a well drilled on the platform the authors were able to distinguish important events within the basin. Within the rift supersequence it was recognized four sequences named as Rift 1, Rift 2, Rift 3 and Rift 4, limited by three sequence boundaries. Rifts 1 and 2 have scattered depositions and the synthetic and antithetic faults start a linkage process. Rift 3 has a wide spread representation throughout the basin covering most part of it. Rift 4 makes up the termination of mechanical subsidence with minor expression in faulting and has experienced an uplift whose led the currently continental shelf to be exposed most part of subsequent events. Drift supersequence was split in two drifting stages. Inasmuch as basin has undergone an uplift, the first drift stage has sedimentation confined to slope and rise regions. Whereas in the second drift stage sedimentation surpasses the border fault and its successions overlie directly rift supersequence in platform. A structural faulting map was built for southern Jacuípe Basin depicting main faulting controls and trends, basin hinge line, main depocenters, the Jacuípe External High and a volcanic plug. The geographic southern boundary with Camamu Basin was set up at a complex zone of transfer and release faults, making up a geologic limit. Adaptations were suggested for a new chronostratigraphic chart for southern Jacuípe Basin.

APA, Harvard, Vancouver, ISO, and other styles

3

Kahmann-Robinson, Julia A. Atchley Stacy C. "The sequence stratigraphic evolution of the Sturgeon Lake bank, central Alberta, Canada and its regional implications." Waco, Tex. : Baylor University, 2005. http://hdl.handle.net/2104/3016.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Isnard, Hélène. "Application des traceurs isotopiques Pb-Pb, Sm-Nd et Lu-Hf à la compréhension de l'histoire archéenne du bouclier canadien et à la formation de la croûte continentale /." Thèse, Chicoutimi : Montréal : Université du Québec à Chicoutimi ;. Université du Québec à Montréal, 2003. http://theses.uqac.ca.

Full text

Abstract:

Thèse (D.R.Min.) -- Université du Québec à Chicoutimi, programme extensionné à l'Université du Québec à Montréal, 2003.
Bibliogr.: f. 203-204. Document électronique également accessible en format PDF. CaQCU

APA, Harvard, Vancouver, ISO, and other styles

5

Shelton, Jessica Anne. "Application of sequence stratigraphy to the nonmarine Upper Cretaceous Two Medicine Formation, Willow Creek anticline, northwestern, Montana." Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/shelton/SheltonJ0507.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Al, Kharusi Laiyyan Mohammed. "Correlation between High Resolution Sequence Stratigraphy and Mechanical Stratigraphy for Enhanced Fracture Characteristic Prediction." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_dissertations/339.

Full text

Abstract:

Sequence stratigraphy relates changes in vertical and lateral facies distribution to relative changes in sea level. These relative changes in carbonates effect early diagenesis, types of pores, cementation and dissolution patterns. As a result, in carbonates, relative changes in sea level significantly impact the lithology, porosity, diagenesis, bed and bounding surfaces which are all factors that control fracture patterns. This study explores these relationships by integrating stratigraphy with fracture analysis and petrophysical properties. A special focus is given to the relationship between mechanical boundaries and sequence stratigraphic boundaries in three different settings: 1) Mississippian strata in Sheep Mountain Anticline, Wyoming, 2) Mississippian limestones in St. Louis, Missouri, and 3) Pennsylvanian limestones intermixed with clastics in the Paradox Basin, Utah. The analysis of these sections demonstrate that a fracture hierarchy exists in relation to the sequence stratigraphic hierarchy. The majority of fractures (80%) terminate at genetic unit boundaries or the internal flooding surface that separates the transgressive from regressive hemicycle. Fractures (20%) that do not terminate at genetic unit boundaries or their internal flooding surface terminate at lower order sequence stratigraphic boundaries or their internal flooding surfaces. Secondly, the fracture spacing relates well to bed thickness in mechanical units no greater than 0.5m in thickness but with increasing bed thickness a scatter from the linear trend is observed. In the Paradox Basin the influence of strain on fracture density is illustrated by two sections measured in different strain regimes. The folded strata at Raplee Anticline has higher fracture densities than the flat-lying beds at the Honaker Trail. Cemented low porosity rocks in the Paradox Basin do not show a correlation between fracture pattern and porosity. However velocity and rock stiffness moduli's display a slight correlation to fracture spacing. Furthermore, bed thickness is found to be only one factor in determining fracture density but with increasing strain, internal bedforms and rock petrophysical heterogeneities influence fracture density patterns. This study illustrates how integrating sedimentologic and sequence stratigraphic interpretations with data on structural kinematics can lead to refined predictive understanding of fracture attributes.

APA, Harvard, Vancouver, ISO, and other styles

7

Richards, Andrew Edward. "The Pleistocene stratigraphy of Herefordshire." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323676.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Beyer, Ross A. "Martian surface roughness and stratigraphy." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/290105.

Full text

Abstract:

Orbital datasets can be combined and manipulated to learn about the three-dimensional structure of planetary surfaces, and the processes that have acted on them. The Mars Orbital Camera (MOC) is providing high-resolution images. These images allow qualitative inspection of features, and contain quantitative information about the shape of the surface. Using a photoclinometry technique derived from a lunar-Lambert photometric function, I am able to obtain estimates of the down-sun slope of each pixel in an image. This technique was calibrated against synthetic topography, compared to an area photoclinometry technique, and applied to the Viking and Pathfinder landing sites. It is a robust technique for obtaining the roughness and slope characteristics of large areas. It was applied to the potential landing sites for the Mars Exploration Rovers to evaluate site safety. The slopes from this point photoclinometry technique can be used to obtain a rough estimate of topography, which I used in a number of studies where topographic information was crucial. MOC images have shown that layering is pervasive on the martian surface. Mars Orbital Laser Altimeter (MOLA) data can be registered to MOC images to provide elevation constraints on layer outcrops. Such layers are observed in eastern Coprates Chasma both in the chasma rim and in a flat-topped massif. Observations indicate that the chasma stratigraphy consists of thin sequences of resistant layers and intervening thicker sequences of relatively less resistant layers. More resistant units cap the massif against erosion and result in steeper slopes than the weaker units would otherwise allow. These resistant layers can be used as stratigraphic markers which have allowed me to measure the subsidence and tilting of the massif relative to the chasma walls, providing evidence for tectonic motion in this portion of the Valles Marineris. These outcrops indicate that some of these layers may be analogus to terristrial flood basalts in both composition and extent. I have constrained the dip angle of finely layered sequences in Ganges and Hebes Mensae. These layers are either flat lying or dip shallowly, but do not dip steeply, which places some constraints on the origin of these mensae.

APA, Harvard, Vancouver, ISO, and other styles

9

Udgata, Devi Bhagabati Prasad. "Glauconite as an indicator of sequence stratigraphic packages in a Lower Paleocene passive-margin shelf succession, Central Alabama." Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Theses/UDGATA_DEVI_55.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Shoore, David Joseph. "Sequence stratigraphy of the Bridal Veil Falls Limestone, carboniferous, Oquirrh Group, on Cascade Mountain, Utah : a standard Morrowan cyclostratigraphy for the Oquirrh basin /." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd775.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Cauxeiro, Cirilo. "Architecture stratigraphique du prisme néogène de la Kwanza, Angola, et relations avec les mouvements verticaux." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20120.

Full text

Abstract:

Ce travail pionnier porte sur l'étude de l'architecture stratigraphique du Bassin de la Cuanza à partir d'une approche conjuguée multi-échelle croisant la géomorphologie, l'interprétation sismique et la sédimentologie de faciès de l'intervalle Oligocène à Actuel. L'objectif est de préciser l'âge, le partitionnement de faciès, les milieux de dépôts de la zone littorale dans le but de dater et de caractériser les mouvements verticaux en relation avec le fluage du sel (tectonique gravitaire) et le soulèvement général de la marge en lien avec la déformation de la lithosphère. L'analyse détaillée des affleurements de la zone côtière permet de manière complémentaire de préciser les conditions de drainage de la paléo-Cuanza avec la mise en évidence d'un prisme deltaïque de type patte d'oiseau au Pliocène qui prograde sur un système éolien côtier. Par ailleurs, plus vers l'intérieur du bassin, à hauteur de BomJesus, une zone de haut-fond conduit à la mise en place d'un Gilbert delta alimenté par une possible proto-Cuanza, en marge de la plate-forme mixte du Miocène inférieur. Plus au large de cette plate-forme, dans le secteur de Cabo do São Braz à Barra do Cuanza, l'analyse détaillée de l'architecture stratigraphique sur les falaises permet de caractériser d'un point de vue faciès et processus de dépôt une succession de systèmes de chenaux-levées en compensation montrant localement des processus d'injection sableuse précoce en lien avec l'instabilité des bordures du chenal. Ces systèmes Oligocène à Pliocène sont étroitement contrôlés par la croissance des diapirs (Cabo Ledo) et alimentés à la fois par les apports fluviatiles, le démantèlement des plis diapiriques et des apports de la plate-forme mixte. A Sangano, les marges des chenaux turbiditiques contiennent des sables bioclastiques à bioturbations de type skolithos et Ophiomorpha qui indiquent l'instabilité gravitaire de la plate-forme qui borde les gouttières subsidentes, avec un potentiel de recolonisation du fond sableux par les faunes "turbiportées". En remontant vers le Nord on passe progressivement à des faciès de pente soulignés par des niveaux de black-shales qui marquent la fenêtre de productivité planctonique. Ces faciès sont surmontés par des marnes à intervalles de tempestites caractéristiques de l'offshore transition. Enfin, au Sud de Miradouro da Lua, on a pu mettre en évidence dans le Miocène supérieur des faciès contouritiques qui remontent la pente suivant une succession de cannelures d'érosion. Ces faciès sont tronqués par des dépôts sableux bioturbés typiques d'un environnement de shoreface. Depuis Cabo de Sao Braz jusqu'à Luanda on observe donc une succession à la fois temporelle et paléo-environnementale qui conforte le modèle de soulèvement différentiel/basculement de la série vers le Nord. Du Sud vers le Nord, on observe ainsi une évolution depuis des dépôts turbiditiquesinterdiapiriques oligocènes à miocènes inférieur dans le secteur de Cabo do São Braz/Cabo Ledo jusqu'à des faciès deltaïques de la paléo-Cuanza Pliocène et fluviatiles de braid-delta Pléistocène à hauteur de Miradouro da Lua
This pioneering work, focuses on the study of the stratigraphic architecture of the Cuanza Basin, from a combined multi-scale approach crossing the geomorphology, seismic interpretation and sedimentologicalfacies from Oligocene interval to Present. The objective is to identify the age, the partitioning of facies, the environments of deposition of the coastal zone in order to date and characterize the vertical movements in relation to the salt creep (gravitational tectonic) and the general uplift of the margin related to the deformation of the lithosphere. Detailed analysis of the outcrops of the coastal zone allowed in a complementary manner specify the conditions of drainage of the paleo-Cuanza putting thus in evidence the identification of a deltaic prism type bird's foot in Pliocene which prograde on a coastal aeolian system. In addition, over to the basin, up to Bom Jesus, a shoal area led to the establishment of a Gilbert delta powered by a possible proto-Cuanza, in conjunction with the mixed platform of lower Miocene. Most off the shelf, in the area of Cabo de Sao Braz to Barra do Cuanza, a detailed analysis of the stratigraphic architecture of the cliffs allowed characterize in a viewpoint facies and depositional processes in a succession of channel-levee systems in compensation, showing locally early sandy injection processes related to the instability of the channel borders. These systems Oligocene to Pliocene are tightly controlled by the growth of diapirs (Cabo Ledo) and and sometimes they are fed by fluvial deposits, dismantling folds diapirs and contributions from mixed platform. In Sangano the turbidite channel banks contain the bioclastic sands with bioturbations type Skolithos and Ophiomorpha which indicate gravitational instability of the shelf that edge the subsidence incisions with a potential for colonization of the sandy bottom by Fauns "turbiportées". Going up to the north we pass gradually to slope facies highlighted by levels of black-shale that marks the window of planktonic productivity. These facies are overlain by marl with intervals of tempestites, characteristics of the offshore transition. Finally, to the South of Miradouro da Lua, we were able to put in evidence in upper Miocene contouritesfacies that climbs the slope following a series of grooves erosion. These facies are truncated by sandy deposits bioturbed typical of shoreface. From Cabo de Sao Braz until Luanda, sometimes is possible to obsreve a temporal and paleoenvironmental succession which reinforces the model of differential uplift or tilting of the series toward to the North. From South to the North, is observed an evolution of interdipiricturbiditic deposits of Oligocene to lower Miocene in the area of Cabo do Sao Braz / Cabo Ledo to deltaic facies of the paleo-Cuanza - Pliocene fluvial braid-delta of Pleistocene in Miradouro da Lua

APA, Harvard, Vancouver, ISO, and other styles

12

Braithwaite, Karen. "Stratigraphy of the mid-Carboniferous boundary." Thesis, University of Leeds, 1995. http://etheses.whiterose.ac.uk/160/.

Full text

Abstract:

This study investigates the stratigraphy of the newly defined mid-Carboniferous boundary. The selection of the mid-Carboniferous stratotype section should reconcile problems between the different mid-Carboniferous biostratigraphies developed throughout the world and provide a standard against which other successions can be correlated. The nature of the mid-Carboniferous boundary in the Clare Basin has been investigated. Various geochemical analyses have been conducted on a mid-Carboniferous section and it has been possible to construct a chart relating these various geochemical parameters to relative sea-level. It is shown that although deposition is complete through the interval, there is a geochemical expression of a lowstand during the lowest Chokierian. Additionally, doubt is cast on the presumption that all sediments deposited outside 'marine bands' are non marine. A model has been developed for mid-Carboniferous deposition in the Clare Basin. It is envisaged that the shelves of the Clare Basin were flooded during the early Namurian leading to an environment suitable for phosphate authigenesis. During a major regression in the Pendleian/lower Arnsbergian the phosphate was reworked into a lag. The lowstand of the basal Chokierian is marked by a thin lag on the shelves, whilst deposition was continuous in the basin centre. Later Chokierian times are marked by a widespread transgression. The mid-Carboniferous stratotype has been chosen at Arrow Canyon,Nevada. Microfacies studies show that deposition was on a winnowed carbonate platform showing reworking of bioclasts. Faunal diversity and eveness studies have also been conducted on this section. No drop in diversity is seen at the mid-Carboniferous boundary, although a drop in eveness is seen, whether this relates to a specialised fauna or selective winnowing of bioclasts is unknown. Correlations between America and western Europe show that conodonts are strongly facies controlled and it is unlikely that the appearance of Declinognathodus noduliferus is truly isochronous between sections, and thus is an unwise choice for defining the mid-Carboniferous boundary. Additionally it is suggested that Arrow Canyon was a poor choice for the stratotype section due to both the possibility of reworking, the presence of an unconformity in the section and possible doubts over the conodont record at this locale. The Rhachistognathus minutus zone is recognized as a new conodont zone across the Arnsbergian/Chokierian boundary.

APA, Harvard, Vancouver, ISO, and other styles

13

Eifert, Tambra L. "The Cretaceous-Paleogene transition in the northern Mississippi Embayment, S.E. Missouri: palynology, micropaleontology, and evidence of a mega-tsunami deposit." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Eifert_09007dcc80658622.pdf.

Full text

Abstract:

Thesis (Ph. D.)--Missouri University of Science and Technology, 2009.
Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed May 4, 2009) Includes bibliographical references (p. 243-265).

APA, Harvard, Vancouver, ISO, and other styles

14

Schlatter, Denis Martin. "Volcanic stratigraphy, chemical stratigraphy and hydrothermal alteration of the Petiknäs South volcanic-hosted massive sulfide deposit, Sweden /." Luleå : Luleå University of Technology, 2005. http://epubl.luth.se/1402-1757/2005/044.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Smith, Tyson Bartek Louis Robert. "Sequence stratigraphy and stratigraphic architecture of the upper Mississippian lower Hinton Formation Appalachian Basin, West Virginia, USA /." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2009. http://dc.lib.unc.edu/u?/etd,2651.

Full text

Abstract:

Thesis (M.S.)--University of North Carolina at Chapel Hill, 2009.
Title from electronic title page (viewed Oct. 5, 2009). "... in partial fulfillment of requirements for the degree of Master's of Geological Sciences in the Department of Geological Sciences." Discipline: Geology; Department/School: Geological Sciences.

APA, Harvard, Vancouver, ISO, and other styles

16

Lira, Olga Berenice. "Subsurface and geochemical stratigraphy of northwestern Oregon." PDXScholar, 1990. https://pdxscholar.library.pdx.edu/open_access_etds/4314.

Full text

Abstract:

Lithological, geophysical, paleontological and geochemical methods were used in order to define the contact relationship between the Keasey and the Cowlitz formations in northwestern Oregon. Drill cuttings from six wells located in Columbia County were analyzed by the Instrumental Neutron Activation Analysis (INAA) method. The concentrations of K, Th, Rb and Sc/Co ratio in the samples established four different groups: 1) High K, Rb, and TH, with low Sc/Co ratio typical of Cowlitz sediments. 2) Low K, Th and Rb and high Sc/Co ratio, more characteristics of the Keasey Formation. 3) Very low concentrations of Rb and high Sc, which is indicative of basaltic volcanism. 4) vertically varying K, Th and Rb concentrations. The provenance of group four is uncertain, but it may represent reworked sediments or the interfingering of the Keasey and the Cowlitz formations. Plots of these elements vs. depth define the geochemical contacts between the formations.

APA, Harvard, Vancouver, ISO, and other styles

17

Stubbs, Dreadnaught G. "A Sequence Stratigraphic Analysis of the Allegheny Group (Middle Pennsylvanian),Southeast Ohio." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1524600396756809.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Morante, Richard. "Permian-Triassic stable isotope stratigraphy of Australia." Phd thesis, Australia : Macquarie University, 1996. http://hdl.handle.net/1959.14/47568.

Full text

Abstract:

"September, 1995"
Thesis (Ph.D.) -- Macquarie University, School of Earth Sciences, 1996.
Bibliography: leaves 171-183.
Introduction -- Australian ð¹³Corg-isotope profiles about the Permian-Triassic (P/TR) boundary -- Strontium isotope seawater curve in the late Permian of Australia -- ð¹³Cco₃ AND ð¹⁸Oco₃ seawater profiles through the Permian-Triassic of Australasia -- Paleomagnetic stratigraphy about the Permian/Triassic boundary in Australia -- Synthesis.
The Permian-Triassic boundary mass extinction is the largest in the Phanerozoic and therefore is the major event in the Phanerozoic. The mass extinction cause is problematical but studying global geochemical and geophysical signatures about the Permian-Triassic boundary can provide insights into the cause of the mass extinction. Global events about the Permian-Triassic boundary are marked by changes in: ð¹³C values of carbon ; ⁸⁷Sr/⁸⁶Sr in unaltered marine calcite ; magnetic polarity. -- This study aims to identify these features in the sedimentary record and to test the ca libration of the Australian biostratigraphical schemes to the global geological timescale. The following features are found in the Permian-Triassic sediments of Australia: a ð¹³Corg in Total Organic Carbon excursion in 12 marine and nonmarine sections from Northwest to Eastern Australia ; a ⁸⁷Sr/⁸⁶Sr minimum in a composite section mainly from the Bowen Basin ; a magnetic polarity reversal in the Cooper Basin, central Australia. The Australian sections are thus time correlated, as follows: The negative ð¹³Corg excursion indicates the Permian-Triassic boundary and occurs: 1) in Eastern and Central Australia at the change from coal measures to barren measures with red beds at the beginning of the Early Triassic coal gap; 2) in Northwest Australia about the boundary between the Hyland Bay Formation and the Mount Goodwin Formation in the Bonaparte Basin and at the boundary between the Hardman Formation and the Blina Shale in the Canning Basin. The base of the negative ð¹³Corg excursion lies at or near the base of the Protohaploxypinus microcorpuspalynological zone. The ⁸⁷Sr/⁸⁶Sr minimum determined about the Guadalupian/Ochoan stage boundary in North America is found in the Bowen Basin about the boundary between the Ingelara and Peawaddy Formations. The ð¹³Corg excursion in the Cooper Basin is near a magnetic reversal within the Permo-Triassic mixed superchron. The implications of these findings include: confirmation of the traditional placement of the Permian-Triassic boundary at the coal measures/barren measures with redbeds boundary in Eastern Australia ; the linking of the the Permian-Triassic boundary to a mass extinction of plant species on land and the beginning of the Triassic coal gap indicated by the Falcisporites Superzone base that is coincident with the negative ð¹³Corg excursion ; a mass extinction causal model that links the ⁸⁷Sr/⁸⁶Sr minimum determined about the Guadalupian/Ochoan stage boundary to a fall in sealevel that led to changing global environmental conditions. The model invokes greenhouse warming as a contributing cause of the mass extinction.
Mode of access: World Wide Web.
xii, 183 leaves ill., maps

APA, Harvard, Vancouver, ISO, and other styles

19

Whiteman, Colin Allerton. "Middle Pleistocene stratigraphy in mid-Essex, England." Thesis, Birkbeck (University of London), 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577466.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Pauley, J. C. "The Longmyndian supergroup : Facies, stratigraphy and structure." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380113.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Rauxloh, Peter David. "A relational database model of archaeologcial stratigraphy." Thesis, University College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243781.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Nicholas, Christopher John. "Strontium isotope stratigraphy in the Cambrian system." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321030.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Jones, Heather L. "Characterizing ancient avulsion stratigraphy and its significance." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1338875291&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Cleveland, David M. Atchley Stacy C. Nordt Lee C. "Fluvial sequence stratigraphy and paleoclimate of the Upper Triassic (Norian-Rhaetian) Chinle Strata, northern New Mexico." Waco, Tex. : Baylor University, 2007. http://hdl.handle.net/2104/5118.

Full text

Abstract:

Thesis (Ph.D.)--Baylor University, 2007.
In the abstract "[delta]13C" the "13" and "[delta]18O" the "18" are superscript; "pCO2" the "2" is subscript. Includes bibliographical references (p. 107-118).

APA, Harvard, Vancouver, ISO, and other styles

25

Jacobson, Holger. "Near-surface stratigraphy of till and glacifluvium near Knaften, northern Sweden : Identifying small-scale stratigraphy using ground-penetrating radar." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-88063.

Full text

Abstract:

The aim of the study was to assess the possibilities in using ground-penetrating radar to identify small-scale stratigraphy in the upper 1 m of a soil profile and to statistically identify differences in the stratigraphic units discovered using the GPR unit. The study area is ca 15 km southwest of Lycksele near a gravel pit on the banks of Örån. It was located on top of a large (>5 m thick) glacifluvial deposit of indeterminate age overlayed by till from the latest deglaciation. The data sampled included 22 radargrams depicting a total length of >1000 m as well as soil samples from three stratigraphic units from three different trenches (9 samples in total). Visual analysis of the stratigraphy took place via trenches as well as by studying the radar images. The radar images show that three stratigraphic units can be identified clearly (ablation till, S1, a transitional layer of mixed till and glacifluvium, S2, and the underlying glacifluvium, S3) but that the border between the two lower units can be opaque at times. Field observations showed this to be due to the genesis of the topmost unit, the ablation till. Observations in the field also showed relict podsolization in a kettle in the northern part of the study area. Grain-size comparison of the three stratigraphic units identified was performed via sieving. Calculations of the weight percentage were then used for statistical analysis to identify any differences between the strata. Results show that there are differences regarding fine material (ø <0.074 mm, p=0.038), gravel (ø > 2 mm, p<0.0001) and sand (p=0.027) within these three stratigraphic units.

APA, Harvard, Vancouver, ISO, and other styles

26

Thomas, Christian G. C. "Sedimentology and stratigraphy of the Falkland Islands Permian with comparisons to Gondwanan stratigraphy of South Africa and South America." Thesis, University of Aberdeen, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367499.

Full text

Abstract:

The Falkland Islands, located in the SW of the South Atlantic Ocean form the only emergent part of a large continental shelf area, the Falkland Plateau. It has long been known since the work of Adie (1952a,b) that the predominantly Devonian and Permian aged onshore strata probably form the missing SE quadrant of the Karoo Basin of South Africa. Until recently relatively little work has been implemented to confirm this beyond doubt. This study provides additional evidence for such origins through comprehensive sedimentological analysis of onshore Permian exposure in the Falkland Islands with a view to providing a robust stratigraphical framework based on sedimentological data, ichnofacies and petrography. Extensive Falkland Islands fieldwork was complemented by similar work in the Sierras Australes, Buenos Aires Province, Argentina, and in Ecca Pass in South Africa to enable comparisons of the Permian stratigraphy. The Falkland Islands stratigraphic succession represents a post-glacial basin-filling episode representing a passage from a deep underfilled to a filled basin. Deposition occurred within a foreland basin. The results indicate a close correlation between the sedimentology and stratigraphy of South Africa and the Falkland Islands, between which stratigraphic units may be correlated at a member level. The Falkland Islands and South African successions are closely comparable in terms of petrographic trends implying a similar provenance. Strata of the Sierras Australes are sedimentologically and petrographically distinct and deposition of the basin-filling succession at this location commenced at an earlier date. Palaeocurrent orientations between the Falklands Islands and the Sierras Australes succession do not compare well, whilst Falkland Islands palaeocurrent orientations only compare with South African examples if the Falkland Islands are rotated by approximately 180° relative to their present orientation.

APA, Harvard, Vancouver, ISO, and other styles

27

Gollop, Alison. "Structural controls on the seismic sequence stratigraphy of the Ben Nevis, Avalon, and Eastern Shoals formations, Terra Nova field, Jeanne D'Arc Basin, offshore Newfoundland /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,76559.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Lapointe, Isabelle. "Caractérisation du système aurifère filonien d'Aquilon - Baie James, Québec /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Cunderla, Brent Joseph. "Stratigraphic and petrologic analysis of trends within the Spencer Formation sandstones : from Corvallis, Benton County, to Henry Hagg Lake, Yamhill and Washington counties, Oregon." PDXScholar, 1986. https://pdxscholar.library.pdx.edu/open_access_etds/3588.

Full text

Abstract:

Within the thesis study area Spencer Formation arkosic/arkosic lithic sandstone lithofacies of Narizian age crop out in a sinuous north-northwesterly band from the Corvallis area into the Henry Hagg Lake vicinity ten kilometers southwest of Forest Grove, Oregon.

APA, Harvard, Vancouver, ISO, and other styles

30

Cousineau, Lyssa A. "Stratigraphy of Quaternary Dunes by Sand Mineralogy and Pedogenic Features, Los Osos, California." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/827.

Full text

Abstract:

The goal of this study was to assess mineralogy and pedogenic features of sand dunes in a stratigraphic sequence. The purpose was to determine whether these features significantly differ to reflect age differences with depth within the sequence. This study was conducted in Montaña de Oro State Park, located on the central Californian coast eighteen kilometers northwest of San Luis Obispo in San Luis Obispo County. Samples were collected from the vertical exposure of one dune face by stratified random sampling at 1.0-m vertical intervals. Particle size distribution was determined through particle-size analysis by hydrometer and sieve. Electrical conductivity and pH were determined using a 1:1 soil/water paste. Total soil carbon and nitrogen contents were determined by combustion. Pedogenic iron oxides were extracted by ammonium oxalate in the dark and citrate-bicarbonate-dithionite, and then quantified by flame atomic absorption spectrometry. Sand mineralogy of fifteen thin sections was analyzed by polarized light microscopy. Grain counts quantified the sand mineralogy of the thin sections. Total carbon significantly decreases with soil depth and age reflecting modern development of soil at 0 to 1 meters within the stratigraphic sequence. Certain morphologic and mineralogic features, including an increase in nitrogen content and the presence of fossilized fungal hyphae, suggest that a buried A horizon may be preserved 9 to 10 meters below the crest of the modern dune complex. Using relative dates compiled from previous research, it was determined that the soil at 9 to 10 meters depth was developed 15-ka to 30-ka after sand deposition during a eustatic sea level lowstand. The presence of fossils in general suggests that the ancient soil was rapidly covered.

APA, Harvard, Vancouver, ISO, and other styles

31

Campo, Bruno <1984&gt. "The Pleistocene-Holocene Transition in the Po Plain (Italy): Stratigraphic Architecture and Sequence Stratigraphy from a Highly-Subsiding Basin." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7540/1/Tesi_dottorato_XXVIII_ciclo_Bruno_Campo_Esame_Finale_2016.pdf.

Full text

Abstract:

This work focuses on the Late Pleistocene-Holocene transition in the southern Po Basin. Five areas were investigated, with the aim of unraveling the role of different allogenic factors (climate, eustacy, sediment supply) on stratigraphic architecture in the last 45 ky. The study starts from the distal portion of the basin (the coastal plain deposits) and then moves towards increasingly internal areas: the alluvial sector characterized by the Po channel belt deposits, and the mud-prone interfluvial succession between the Apenninic margin and the Po channel belt. In the coastal sector, high-resolution facies analysis, along with a well-constrained chronostratigraphic framework, led to the accurate paleoenvironmental reconstruction of the last 45 ky BP depositional history along the 93 km-long transect. It is also provided a sequence stratigraphic interpretation for the whole sedimentary succession. In the Po channel belt sector, based on 28 radiocarbon dates, facies interpretation from high-quality core descriptions and freshly-drilled continuous cores, the contrasting stratigraphic architecture of Late Pleistocene and Holocene deposits was highlighted. Changes in lithofacies and channel stacking patterns reveal the vertical superposition of amalgamated fluvial-channel sands (Late Pleistocene) and mud-dominated deposits (Holocene), with isolated fluvial-channel bodies. We also attempted to establish the link between facies architecture, sea-level fluctuations and climate changes. The 3rd study area (interfuvial succession) was selected to test a new method for paleosol identification, on the basis of geotechnical properties generated from pocket penetrometer values. Through the reconstruction of the Biferno coastal deposits (4th study area, located ca. 300 km south of the Po Plain) we had the opportunity to document two coeval (Late Pleistocene - Holocene) coastal sedimentary successions, diverging in terms of shelf gradient and proximity to the LGM-lowstand Po Delta. The 5th study area, broadly coincides with Ferrara, was selected to show how high-resolution stratigraphic studies can be used for aquifer protection.

APA, Harvard, Vancouver, ISO, and other styles

32

Campo, Bruno <1984&gt. "The Pleistocene-Holocene Transition in the Po Plain (Italy): Stratigraphic Architecture and Sequence Stratigraphy from a Highly-Subsiding Basin." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7540/.

Full text

Abstract:

This work focuses on the Late Pleistocene-Holocene transition in the southern Po Basin. Five areas were investigated, with the aim of unraveling the role of different allogenic factors (climate, eustacy, sediment supply) on stratigraphic architecture in the last 45 ky. The study starts from the distal portion of the basin (the coastal plain deposits) and then moves towards increasingly internal areas: the alluvial sector characterized by the Po channel belt deposits, and the mud-prone interfluvial succession between the Apenninic margin and the Po channel belt. In the coastal sector, high-resolution facies analysis, along with a well-constrained chronostratigraphic framework, led to the accurate paleoenvironmental reconstruction of the last 45 ky BP depositional history along the 93 km-long transect. It is also provided a sequence stratigraphic interpretation for the whole sedimentary succession. In the Po channel belt sector, based on 28 radiocarbon dates, facies interpretation from high-quality core descriptions and freshly-drilled continuous cores, the contrasting stratigraphic architecture of Late Pleistocene and Holocene deposits was highlighted. Changes in lithofacies and channel stacking patterns reveal the vertical superposition of amalgamated fluvial-channel sands (Late Pleistocene) and mud-dominated deposits (Holocene), with isolated fluvial-channel bodies. We also attempted to establish the link between facies architecture, sea-level fluctuations and climate changes. The 3rd study area (interfuvial succession) was selected to test a new method for paleosol identification, on the basis of geotechnical properties generated from pocket penetrometer values. Through the reconstruction of the Biferno coastal deposits (4th study area, located ca. 300 km south of the Po Plain) we had the opportunity to document two coeval (Late Pleistocene - Holocene) coastal sedimentary successions, diverging in terms of shelf gradient and proximity to the LGM-lowstand Po Delta. The 5th study area, broadly coincides with Ferrara, was selected to show how high-resolution stratigraphic studies can be used for aquifer protection.

APA, Harvard, Vancouver, ISO, and other styles

33

Cross, Guy Matthew. "Radar imaging glacio-volcanic stratigraphy : Mt. Wrangell, Alaska." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26195.

Full text

Abstract:

An airborne radar survey was conducted over the ice-filled volcanic caldera at Mt. Wrangell, Alaska. Research reported here involves computer processing and interpretation of radio-reflection data acquired over 21 traverses of the summit. In addition to describing useful data enhancement techniques, a dynamic programming approach is introduced for topographically controlled data positioning and spatial correction. Interpretation focusses upon a well defined radio-stratigraphy attributed to high acidity horizons deposited at the ice surface during periods of elevated volcanic activity. A comparative analysis of layer character indicates that echoes from the caldera floor are not continuously detected because of anomalously high signal absorption. Consequently, results impose a lower limit upon maximum ice thickness. A numerical interpretation scheme, incorporating both glaciological measurements and empirical relations governing the behaviour of firn and ice, is developed to aid interpretation of the glacio-volcanic stratigraphy. Preliminary modelling yields a speculative volcanic record that roughly matches the known eruption sequence at Mt. Wrangell and suggests a significant extension of the volcanic history.
Science, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate

APA, Harvard, Vancouver, ISO, and other styles

34

Ala, Davin. "High-resolution isotope stratigraphy of the Lower Devonian." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/9656.

Full text

Abstract:

A new data set of 53 $\sp‡$Sr/$\sp†$Sr ratios for the Lower Devonian has been collected from well preserved, and stratigraphically well constrained, brachiopod shells from the Leon region in Spain, western Urals in Russia, Podolia in Ukraine and New York State in the United States. Multiple criteria, including trace element and stable isotope (C, O) analysis, scanning electron microscopy, cathodoluminescence and optical light microscopy, were used to determine the state of preservation of the samples. One hundred and ten samples were analysed for $\delta\sp $C, with the results ranging from $-$1.49 to 5.5$\perthous$ (VPDB). The carbon isotope trend through the Lower Devonian is characterized by a flat slope within ${\pm}1.5\perthous$ of the mean value. One hundred and ten samples were analysed for $\delta\sp $O, with results that ranged from $-$8.84 to ${-}1.89\perthous$ (VPDB). The oxygen isotope trend through the lower Devonian is flat, except for the New York State samples which fall ${\sim}2\perthous$ lighter, probably because of the ambient temperature of the coeval seawater. For $\sp‡$Sr/$\sp†$Sr, the new data set is continuous and consistent for all study areas and shows a decrease from 0.70882 to 0.70782 from the Pridoli to the Emsian/Eifelian boundary. The Lower Devonian trend also fits well with the previously published Middle Devonian data. In detail, a relatively stable $\sp‡$Sr/$\sp†$Sr ratio for the Lochkovian is followed by a rapid decrease through the Pragian, and by a period of short-term small oscillations $(2\times 10\sp{-4})$ in the Emsian and the Eifelian. The observed decline in $\sp‡$Sr throughout the Lower Devonian may suggest that the fraction of strontium derived from seawater/mantle interactions is on the increase through the Lower Devonian in relation to strontium derived from sialic sources such as weathering of the continents. Paleogeographic and biogeographic data for this time period suggest that the relative sea level in the Lower Devonian was rising, possibly due to increased spreading rates at MOR's, in accord with the observed strontium isotope trend. In terms of stratigraphic resolution, the slope of the $\sp‡$Sr/$\sp†$Sr curve for the Lochkovian is too flat to be of utility for correlation purposes. In contrast, the steep slope observed in the Pragian and steep short-term fluctuations found in the Emsian may provide stratigraphic resolution on the order of 1-2 Ma.

APA, Harvard, Vancouver, ISO, and other styles

35

Suchy, Daniel R. "Hudson Bay platform : silurian sequence stratigraphy and paleoenvironments." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70280.

Full text

Abstract:

Trends in relative sea-level change, shown by curves drawn from drill core and outcrop sections in Llandoverian carbonates of the Hudson Bay Platform, were used to correlate individual parasequences among widely separated localities. Two sequences, bounded by regional disconformities, include: (1) the Severn River Formation, and (2) the Ekwan River, Attawapiskat, and Kenogami River Formations. Initial onlap of marine facies at the base of the Severn River Formation progressed from north to south, occurring first in the Hudson Bay Basin, then in the Moose River Basin; final retreat of the seas at the end of Attawapiskat time was in the opposite direction. The most extensive inundations occurred during Ekwan River and Attawapiskat depositional times. Large-scale trends in the curves delineate four major Early Silurian sea-level highstands also recognized in other basins.
Reefs in outcrops along the Attawapiskat River represent one interval of reef growth, had a syndepositional relief of 8-10 meters, and were terminated by a relative sea-level fall. Their present distribution is controlled by variously uplifted fault blocks.
The most important diagenetic processes were early marine cementation and shallow burial diagenesis, and in the southwestern Moose River Basin early secondary dolomitization.

APA, Harvard, Vancouver, ISO, and other styles

36

Moncrieff, A. C. M. "The Vendian stratigraphy and sedimentology of East Greenland." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330127.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Mowbray, Leslie Allen. "Quaternary Chronology and Stratigraphy of Mickey Springs, Oregon." Thesis, Portland State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=1606164.

Full text

Abstract:

Mickey Springs in the Alvord Desert, southeast Oregon, is analogous to other Basin and Range hydrothermal systems where the requisite conditions of heat source and permeable pathways are met through crustal thinning due to normal faulting. This study examines the morphology and lifespan of near-surface spring features through use of ground penetrating radar, thermoluminescence (TL) dating, and elevation modeling. Duration of hydrothermal activity at Mickey Springs has not previously been determined, and age determinations of sinter at the site are conflicting. The reason for and timing of this change in silica saturation in the hydrothermal fluid has not been resolved.

Three morphologies of silica sinter deposition have been identified at Mickey Springs. These are (1) well-sorted, fine-grained sandstone with ripple marks, cross beds and preserved root casts, to poorly-sorted conglomerate of primarily basalt clasts, both cemented by coeval silica deposition, (2) large depressions (12-32 m diameter) rimmed with sinter, characterized by fine silt and clay blanketing a sinter apron and infilling the central depression, and (3) quaquaversal sinter mounds identified by outcropping pool-edge sinter typically surrounding a shallow depression of loose sediment.

Silica-cemented sandstone and conglomerate were the first features formed by coeval hydrothermal processes at the site, and were emplaced prior to 30 kya as suggested by structural and stratigraphic relationships. Structure between two interacting fault tips may have constrained the extent of silica cementation. By 30 kya, a left-stepping fault oriented roughly north/south further constrained the near-surface permeable zone. TL dates from sediment stratigraphically below and above sinter aprons around mounds and depressions (former spring vents) indicate sinter deposition between 30 and 20 kya. Location of these features was dictated by development of the left-stepping fault. As pluvial Lake Alvord filled at the end of the Pleistocene, lake sediment filled most vents, which were largely inactive, with fine-grained silt and clay.

Today, hydrothermal activity persists in two modes: (1) The current high-temperature springs, steam vents and mudpots concentrated in a 50 x 50 m area south of the sinter mounds and depressions, and (2) scattered springs and steam vents that exploit previous permeable pathways that once provided the hydrothermal fluid which precipitated the sinter aprons. Currently there is no active silica sinter deposition at Mickey Springs.

Structures and stratigraphic relationships identified through this study favor a transport-limited and structurally controlled model of fluid transport. Sinter deposition is determined to have occurred before the most recent highstand of pluvial Lake Alvord. A climate driven model, where groundwater recharge from pluvial Lake Alvord circulates to a deep heat source and enhances spring discharge, is not supported by these findings, as no evidence was found for sinter precipitation after the drying of the lake. Future studies of other hydrothermal systems in the Basin and Range may reveal that permeable pathways along local structures are the primary drivers in this region.

APA, Harvard, Vancouver, ISO, and other styles

38

Dastanpour, Mohammad. "The Devonian stratigraphy of Kerman, southeast central Iran." Thesis, University of Bristol, 1990. http://hdl.handle.net/1983/5af05e94-ca3e-4e6e-ab46-e6dad2dde86d.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Charvin, Karl. "Inverse and Forward Modelling of Shallow-Marine Stratigraphy." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/4280.

Full text

Abstract:

This thesis presents the development and application of a numerical inverse and forward model of stratigraphy applied to shallow-marine wave-dominated sedimentary systems. The approach links a 'process-based' forward model of stratigraphy (i.e. BARSIM, developed by J.E.A. Storms, University of Delft) to a fully non-linear stochastic inverse scheme. The inverse problem has been formulated using a Bayesian framework in order to sample the full range of uncertainty and explicitly build in prior knowledge. The methodology combines Reversible Jump Markov chain Monte Carlo and Simulated Tempering algorithms which are able to deal with variable dimensional inverse problems and multi-modal posterior probability distributions, respectively. The numerical scheme requires the construction of a likelihood function to quantify the agreement between simulated and observed data (e.g. sediment ages and thicknesses, grain-size distributions). Prior to real case study applications, the method has been successfully validated on different scenarios built from synthetic data, in which the impact of data distribution, quantity and quality on the uncertainty of the inferred environmental parameters were investigated. The numerical scheme has then been applied to two case studies: the outcrop-constrained Lower Cretaceous 'Standardville' parasequence of the Aberdeen Member of the Blackhawk Formation (Boock Cliffs, Utah, U.S.A.) and the Emsian sub-surface data of South Algeria. The inverse modelling scheme successfully reproduced stratigraphic architecture in both cases, within the constraints of the input data quality. The inferences of the relative sea level, sediment supply and wave regime histories contribute to the understanding of mechanisms that produced the observed stratigraphy. Of equal importance, the inverse results allowed complete characterisation of uncertainties in these forcing parameters and in the stratigraphic architecture developed in between data constraints. These results suggest that the inverse model may ultimately provide a process-based geological complement to standard geostatistical tools for the static characterization of hydrocarbon reservoirs.

APA, Harvard, Vancouver, ISO, and other styles

40

Mowbray, Leslie Allen. "Quaternary Chronology and Stratigraphy of Mickey Springs, Oregon." PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2637.

Full text

Abstract:

Mickey Springs in the Alvord Desert, southeast Oregon, is analogous to other Basin and Range hydrothermal systems where the requisite conditions of heat source and permeable pathways are met through crustal thinning due to normal faulting. This study examines the morphology and lifespan of near-surface spring features through use of ground penetrating radar, thermoluminescence (TL) dating, and elevation modeling. Duration of hydrothermal activity at Mickey Springs has not previously been determined, and age determinations of sinter at the site are conflicting. The reason for and timing of this change in silica saturation in the hydrothermal fluid has not been resolved. Three morphologies of silica sinter deposition have been identified at Mickey Springs. These are (1) well-sorted, fine-grained sandstone with ripple marks, cross beds and preserved root casts, to poorly-sorted conglomerate of primarily basalt clasts, both cemented by coeval silica deposition, (2) large depressions (12-32 m diameter) rimmed with sinter, characterized by fine silt and clay blanketing a sinter apron and infilling the central depression, and (3) quaquaversal sinter mounds identified by outcropping pool-edge sinter typically surrounding a shallow depression of loose sediment. Silica-cemented sandstone and conglomerate were the first features formed by coeval hydrothermal processes at the site, and were emplaced prior to 30 kya as suggested by structural and stratigraphic relationships. Structure between two interacting fault tips may have constrained the extent of silica cementation. By 30 kya, a left-stepping fault oriented roughly north/south further constrained the near-surface permeable zone. TL dates from sediment stratigraphically below and above sinter aprons around mounds and depressions (former spring vents) indicate sinter deposition between 30 and 20 kya. Location of these features was dictated by development of the left-stepping fault. As pluvial Lake Alvord filled at the end of the Pleistocene, lake sediment filled most vents, which were largely inactive, with fine-grained silt and clay. Today, hydrothermal activity persists in two modes: (1) The current high-temperature springs, steam vents and mudpots concentrated in a 50 x 50 m area south of the sinter mounds and depressions, and (2) scattered springs and steam vents that exploit previous permeable pathways that once provided the hydrothermal fluid which precipitated the sinter aprons. Currently there is no active silica sinter deposition at Mickey Springs. Structures and stratigraphic relationships identified through this study favor a transport-limited and structurally controlled model of fluid transport. Sinter deposition is determined to have occurred before the most recent highstand of pluvial Lake Alvord. A climate driven model, where groundwater recharge from pluvial Lake Alvord circulates to a deep heat source and enhances spring discharge, is not supported by these findings, as no evidence was found for sinter precipitation after the drying of the lake. Future studies of other hydrothermal systems in the Basin and Range may reveal that permeable pathways along local structures are the primary drivers in this region.

APA, Harvard, Vancouver, ISO, and other styles

41

Bozetti, Guilherme. "Stratigraphy and architecture of a coarse-grained deep-water system within the Cretaceous Cerro Toto formation, Silla Syncline area, southern Chile." Thesis, University of Aberdeen, 2017. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=235577.

Full text

Abstract:

The Upper Cretaceous Cerro Toro Formation, southern Chile, is characterised by thinbedded turbidites that envelope a series of coarse-grained, confined slope complex systems, interpreted as part of the Lago Sofia Member. This deep-water slope system overlies basin floor sheets of the Punta Barrosa Formation, and is overlain by the sand-filled slope channels of the Tres Pasos Formation. Particularly distinctive beds, known as TEDs (transitional event deposits), are up to 40 m thick, laterally extensive, have prominent fluted bases, and have a vertical fabric starting with (1) a thin, inversely-graded, clast-supported base; then (2) a normally-graded and clastsupported interval; (3) an increasingly sand and clay matrix-supported conglomerate, with (4) a progressive upwards increase in matrix and normally grading, both in the floating gravel clast and matrix grain sizes, towards the top; and (5) a co-genetic sandstone on top. In the Cerro Toro formation, these TEDs tend to occur as multiple beds in the initial phases of deposition of each channel complex system. The TEDs are highly aggradational, slightly more amalgamated in the channel-axis, and more layered towards the margins. The fabric of these spectacular event beds is described in some detail from measured sections, combined with petrographic analysis and high-resolution field mapping. The 4 km x 200 m channel systems are contained within topographically irregular bathymetric lows that formed sediment pathways, interpreted to be either the result of slope deformation, or contained by poorly preserved, tectonically disrupted or slumped external levee. Syn-sedimentary tectonism is interpreted to be responsible for sharp changes in the system's architecture from channels to ponds, marked by a sharp change in lithofacies from dominantly conglomerates to dominantly sandstones. A refined architectural analysis is proposed, focusing on the recurrent pattern of at least 5 cycles of conglomerate-filled channel systems – ponded sheet sandstones.

APA, Harvard, Vancouver, ISO, and other styles

42

Lini, Andrea. "Early Cretaceous carbon isotope stratigraphy of the Maiolica Formation, Southern Alps (northern Italy and southern Switzerland) : stratigraphic and paleoenvironmental significance /." [S.l.] : [s.n.], 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10492.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

BARTHOLOMEW, ALEXANDER. "CORRELATION OF HIGH ORDER CYCLES IN THE MARINE-PARALIC TRANSITION OF THE UPPER MIDDLE DEVONIAN (GIVETIAN) MOSCOW FORMATION, EASTERN NEW YORK STATE." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1022593337.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Natasia, Nanda. "Architecture of the Early to Late Miocene Upper Cibulakan Formation, North West Java Basin, Indonesia : Insights from sequence stratigraphy and Stratigraphic Modeling." Electronic Thesis or Diss., Sorbonne université, 2024. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2024SORUS040.pdf.

Full text

Abstract:

Cette étude explore l'évolution stratigraphique séquentielle de la Formation Cibulakan supérieure, du Miocène inférieur au Miocène supérieur, dans le bassin Nord-Ouest Java, en Indonésie. Les objectifs principaux de ce travail sont de reconstruire les environnements de dépôt, de comprendre l'évolution stratigraphique régionale et de comprendre quels sont les paramètres contrôlant l'architecture des dépôts et des formations réservoirs par une étude de sensibilité du modèle stratigraphique. L'étude utilise une approche stratigraphique séquentielle indépendante du modèle, intégrant des données sédimentologiques, biostratigraphiques, de diagraphie et sismiques.La méthodologie comprend deux phases principales: le développement d'un cadre stratigraphique séquentiel et la modélisation stratigraphique. Le cadre stratigraphique séquentiel est construit en identifiant les limites de séquence, les surfaces d'inondation maximale et les surfaces de transgression. Les données biostratigraphiques, la détermination des électrofaciès, la corrélation puits à puits et l'interprétation sismique contribuent à définir ce cadre stratigraphique. L'identification des faciès sismiques renforce davantage la compréhension, en reliant les géométries des réflecteurs sismiques aux processus de dépôt. La deuxième phase utilise la modélisation stratigraphique par l'utilisation du logiciel Dionisosflow. Cette technique numérique simule le remplissage du bassin sur des échelles de temps géologiques, en tenant compte de facteurs tels que la déformation tectonique, la subsidence, les fluctuations du niveau de la mer et le flux sédimentaire. L'étalonnage implique l'évolution structurelle du bassin, les paramètres d'entrée des sédiments (source, taille de grain, flux d'eau) et les paramètres de transport particulaires. Les modèles sont classés en fonction des faciès de dépôt, et des analyses d'incertitude et de sensibilité évaluant l'impact de divers paramètres.Les résultats montrent l'intégration des données biostratigraphiques, des données de puits et des données sismiques, ce qui permet de mieux comprendre l'évolution géologique du bassin du nord-ouest de Java. Douze séquences stratigraphique de troisième ordre, imbriquées en trois séquences du deuxième ordre, ont été interprétées au sein de la Formation Cibulakan supérieure. Quatre associations de faciès ont été révélées, basées sur l'évolution des diagraphies (gamma-ray) ; et neuf faciès sismiques ont été identifiés, tous caractérisés par une géométrie et une configuration de réflecteurs (incluant les terminaisons tratales) uniques. L'Aquitainien - le Burdigalien précoce a marqué la dominance des deltas nordiques et nord-est, tandis que le Burdigalien - le Langhien précoce a vu une progradation deltaïque ultérieure vers le sud. Le Langhien - le Serravallien a été caractérisé par une transgression, entraînant l'abandon du delta et l'émergence de bancs marins de marée. Le Tortonien a été marqué par une subsidence du bassin, une diminution de l'approvisionnement en sédiments et la formation de récifs carbonatés isolés.La simulation de la modélisation stratigraphique a été réalisée sur une période de 22,2 à 8,4 millions d'années. L'accommodation des sédiments est régie par l'eustatisme et la tectonique ; les paramètres de transport des sédiments sont soigneusement sélectionnés par une analyse systématique et des tests de sensibilité sont effectués afin de garantir l'exactitude des modèles dans la reproduction des variations observées d'épaisseur et de lithologie. L'analyse de la distribution potentielle des réservoirs montre que les zones de réservoir prospectives ont tendance à suivre une orientation nord-sud, influencée par la direction du rift qui a conduit à une compaction différentielle des sédiments et à une géométrie deltaïque, influençant l'espace d'accommodation
This study explores the sequence stratigraphic evolution of the Early to late Miocene Upper Cibulakan Formation in the North West Java Basin, Indonesia. The primary objectives are to reconstruct depositional environments, understand regional stratigraphic evolution, and forecast the physical and dynamic parameters controlling the distribution of potential reservoir stratigraphic forward modeling. The study employs a model-independent sequence stratigraphic approach, integrating sedimentological, biostratigraphic, well log, and seismic data.The methodology involves two main phases: the development of a sequence stratigraphic framework and stratigraphic forward modeling. The sequence stratigraphic framework is built by identifying sequence boundaries, maximum flooding surfaces, and transgressive surfaces. Biostratigraphic data, electrofacies determination, well-to-well correlation, and seismic interpretation contribute to this framework. Seismic facies identification further enhances understanding, linking seismic reflector geometries to depositional processes. The second phase employs stratigraphic forward modeling using the Dionisosflow. This numerical technique simulates basin infill over geological time scales, considering factors like tectonic deformation, subsidence, sea level fluctuations, and sediment flux. Calibration involves structural evolution, sediment input settings, and transport parameters. The models are classified based on depositional facies, and uncertainty and sensitivity analyses assess the impact of various parameters.Results showcase the integration of biostratigraphic, well, and seismic data, providing insights into the geological evolution of the North West Java Basin. Twelve third-order sequences, organized into three second-order sequences, were interpreted within the Upper Cibulakan Formation. Four facies association has been revealed, based on gamma-ray log values; and nine seismic facies were identified, characterized by unique geometry and reflector configuration as well as stratal termination. The Aquitanian - early Burdigalian marked the dominance of northern and northeastern deltas, while the Burdigalian - early Langhian saw further deltaic progradation southward. The Langhian - Serravallian was characterized by a transgression, leading to the abandonment of the delta and the emergence of marine tidal bars. The Tortonian witnessed basin subsidence, reduced sediment supply, and the formation of isolated carbonate reefs.The Stratigraphic Forward Modeling simulation, involving a timeframe from 22.2 to 8.4 Ma, was constructed. The accommodation of sediment is governed by eustasy and tectonics; the sediment transport parameters, are carefully selected through systematic analysis and sensitivity testing, ensuring accuracy of the models in replicating observed thickness and lithological variations. The analysis of potential reservoir distribution shows that the prospective reservoir zones tend to follow a north-south orientation, influenced by rift direction that led to different sediment compaction and delta geometry, which influence accommodation space. Based on uncertainty and sensitivity analysis, sediment supply appears to be the most influential parameter compared to other parameters in the modeling

APA, Harvard, Vancouver, ISO, and other styles

45

Demirel, Seda. "Foraminiferal Paleontology And Sequence Stratigraphy In The Upper Visean." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614831/index.pdf.

Full text

Abstract:

The aim of this study is to investigate the Upper Visean substages, delineate the Visean - Serpukhovian boundary with calcareous foraminifera and interpret the foraminiferal evolution and sequence stratigraphical framework by using sedimentary cyclicity across the boundary section. For this purpose a 59,61 m thick stratigraphic section consisting of mainly limestone and partly sandstone and shale is measured in the Aziziye Gedigi and Oruç
oglu Formations in the Pinarbasi Region of Eastern Taurides. A detailed micropaleontological study has revealed presence of important foraminiferal groups namely, parathuramminids, earlandiids, endothyroids, archaediscids, biseriamminids, fusulinids, loeblichids, tournayellids and paleotextularids and 145 species and three biozones. The biozones are, in ascending order, Eostaffella ikensis &ndash
Vissarionovella tujmasensis Zone (Mikhailovsky
Late Visean), Endothyranopsis cf. sphaerica &ndash
Biseriella parva Zone (Venevsky
Late Visean) and Eostaffella pseudostruvei &ndash
Archaediscids @ tenuis stage Zone (Taurssk
Early Serpukhovian). A detailed microfacies analysis was carried out in order to understand the depositional history and sedimentary cyclicity and construct the sequence stratigraphic framework of the studied area. Three main depositional environments consisting of open marine, shoal or bank and tidal flat environments were interpreted based on the analysis of 12 major microfacies and 11 sub-microfacies types. Based on the vertical association of microfacies twenty-six cycles, two sequence boundaries and three sequences were recognized in the studied section and these two sequence boundaries, which correspond to the Mikhailovsky and Venevsky horizons, are the records of the global sea level changes during the Late Paleozoic Ice Age. Within this context Visean &ndash
Serpukhovian boundary falls in the transgressive system tract of the third sequence. The duration of cycles are calculated as 117 ky and interpreted as orbitally induced glacioeustatic cycles.

APA, Harvard, Vancouver, ISO, and other styles

46

Owoyemi, Ajibola Olaoluwa. "Sequence stratigraphy of Niger Delta, Delta field, offshore Nigeria." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2768.

Full text

Abstract:

The Niger Delta clastic wedge formed along the West Africa passive margin. This wedge has been divided into three formations that reflect long-term progradation: 1) pro-delta shales of the Akata Formation (Paleocene to Recent), 2) deltaic and paralic facies of the Agbada Formation (Eocene to Recent) and 3) fluviatile facies of the Benin Formation (Oligocene-Recent). This study combines a three-dimensional seismic image with well log data from Delta field to describe lithic variations of the Agbada Formation and develop a sequence stratigraphic framework. The 5000-feet thick Agbada Formation in Delta field is divided by five major sequence boundaries, each observed in seismic cross sections to significantly truncate underlying strata. Sequence boundaries developed as mass flows eroded slopes steepened by the structural collapse of the Niger Delta clastic wedge. Basal deposits directly overlying areas of deepest incision along sequence boundaries formed by the migration of large, sinuous turbidite channels. Upward-coarsening sets of inclined beds, hundreds of feet thick, record progradation of deltas into turbidite-carved canyons and onto down faulted blocks. Thinner, more continuous seismic reflections higher within sequences are associated with blocky and upward-fining well-log patterns interpreted to reflect deposition in shoreline, paralic, and fluvial environments. Episodes of structural collapse of the Niger Delta clastic wedge appear to be associated with progradation of Agbada Formation sediments and the loading of underlying Akata Formation shales. Progradation may have been more rapid during third order eustatic sea level falls. Effects of syn-sedimentary deformation on patterns of sediment transport and deposition are more pronounced in lower sequences within the Agbada Formation, and include: 1) incision into foot walls of listric normal faults, 2) abrupt reorientation of channelized flow pathways across faults, and 3) thinning of deposits across crests of rollover anticlines on down thrown fault blocks. Structural controls on deposition are less pronounced within younger sequences and canyon incisions along sequence boundaries are more pronounced, suggesting that the locus of sediment accumulation and structural collapse of the clastic wedge moved farther basinward as accommodation was filled in the area of Delta field.

APA, Harvard, Vancouver, ISO, and other styles

47

Magbagbeola, Olusola Akintayo. "Sequence stratigraphy of Niger Delta, Robertkiri field, onshore Nigeria." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4768.

Full text

Abstract:

Deposits of Robertkiri field, in the central offshore area of Niger Delta, comprise a 4 km thick succession of Pliocene to Miocene non-marine and shallow marine deposits. A sequence stratigraphic framework for Robertkiri field strata was constructed by combining data from 20 well logs and a seismic volume spanning 1400 km2. Major sequences, hundreds of meters thick, define layers of reservoir and sealing strata formed during episodic progradation and retrogradation of deltaic shorelines. These deposits progress upward from fine-grained prodelta and deep water shales of the Akata Formation through paralic sandstone-shale units of the Agbada Formation and finally to sandy non-marine deposits of the Benin Formation. The Agbada Formation is divided into six third-order sequences starting at the first seismic reflection that can be mapped across the seismic volume. The Agbada Formation under Robertkiri field is complexly deformed across a succession of major, cuspate, offshore-dipping, normal faults, and associated antithetic faults and rollover anticlines within down-dropped blocks. Thickening of intervals between some reflections across major faults and away from the crests of adjacent rollover anticlines suggest syndepositional displacement. Relationships between major faults and the thickness of transparent seismic facies that comprise lower parts of the seismic record suggest faulting was associated with movement of undercompacted shales within the Akata and lower Agbada Formations. Robertkiri field is located along the proximal margin of the Coastal Swamp I depobelt, a subbasin within the Niger Delta clastic wedge formed by margin collapse into underlying undercompacted shale. Accommodation and sequence development in this setting is controlled by both structural faulting and sea level fluctuations. Upsection, sequences become thinner, more laterally uniform in thickness, less structurally deformed and contain less growth strata. Erosion along sequence boundaries becomes progressively shallower and broader, as accommodation under Robertkiri field declined and more sediment was bypassed basinward. Incisions along the base of older sequences (>100 m) is greater than 3rd order sea level falls reported to occur during the Miocene, which suggests that there were local areas of tectonic uplift within this dominantly extensional setting.

APA, Harvard, Vancouver, ISO, and other styles

48

Xu, Li. "Stratigraphy and sedimentology of the Upper Carboniferous, NW Devon." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317895.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Page, K. N. "The stratigraphy and ammonites of the British Lower Callovian." Thesis, University College London (University of London), 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535646.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Ardill, John. "Sequence stratigraphy of the Mesozoic Domeyko basin, northern Chile." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307620.

Full text

Abstract:

The Domeyko basin of northern Chile records Late Triassic-Early Cretaceous mixed carbonate and siliciclastic marine deposition along the western margin of Gondwana. The carbonate and siliciclastic ramp environment is characterised by the deposition of siliciclastic-dominated sediments at times of low accommodation space (lowstand and late highstand systems tracts) and carbonate-dominated sediments during periods of high accommodation space (transgressive and early highstand systems tracts). Along strike variations in siliciclastic sediment supply do not overprint the effects of basinwide changes of relative sea-level. Sequence stratigraphical analysis identifies five second-order sequences resulting from changes in accommodation space and hence, relative sea-level. Within these second-order cycles a higher-frequency cyclicity has also been identified. Each second-order sequence is composed of between 3 and 5 high-frequency sequences which results in a second-order composite sequence, but does not produce the "typical" sequence-sets normally associated with composite sequences. Comparison of the relative sea-level fluctuations interpreted from the Domeyko basin succession with those documented from other similar age South American marginal basins and northern hemisphere basins allows the distinction of regional from global events, and a methodology for potentially differentiating between eustatic and tectonic driving mechanisms. The choice of these basins permits an objective analysis of relative sea-level change using basins of different tectonic setting, on different continental plates. Relative sea-level fall in the late Early Sinemurian, earliest Pliensbachian, earliest Aalenian, Early Callovian, earliest Valanginian, and rises in the earliest Hettangian, earliest and Late Toarcian, Early and Late Bajocian, Late Bathonian and earliest Oxfordian of the Dorneyko basin appear time-equivalent to similar events in other southern and northern hemisphere basins and thus are interpreted to be products of eustatically driven, global sea-level cycles. Relative sea-level falls in the earliest Bathonian, Late Oxfordian, earliest Valanginian and rises in the Late Kimmeridgian are interpreted to be tectonically-driven, continental-scale changes in accommodation space. Although the earliest Valanginian relative sea-level fall can also be seen globally the sequence boundary is interpreted to be tectonically-enhanced by documented regional uplift in Chile and Argentina. The Domeyko basin succession appears to be dominantly controlled by global sea-level fluctuations during the Early-Middle Jurassic, interpreted to have been driven by glacio-eustasy, and by continental-scale fluctuations during the Middle Jurassic to mid-Cretaceous. Mesozoic back-arc basins of western South America record both eustatic and subduction-related relative sea-level fluctuations. To date, the latter have been assumed to be driven chiefly by Pacific plate spreading. However, five tectonically-driven sequence boundaries in the Domeyko and Neuquen basins which have no time correlative expressions in northern hemisphere basins display a close temporal association with five major Gondwanan fragmentation phases. They are: (A) the earliest Bathonian (170 Ma) sequence boundary was driven by the separation of Laurasia and Gondwana; (B) the Late Oxfordian (157 Ma) salinity crisis was driven by the separation of west from east Gondwana; (C) the termination of the marine Domeyko basin was driven by the fragmentation of east Gondwana; CD) the termination of the marine Neuquen Basin (114 Mal was driven by the opening of the South Atlantic; and (E) the major basin inversion associated with the Peruvian tectonic event (100 Mal was driven by the final fragmentation phase within east Gondwana. It is deduced that plate reorganisation associated with the initiation of new oceans during Gondwanan fragmentation resulted in increased coupling along the Andean subduction zone producing regional uplift and thus relative sea-level fall. Responses variously involve: basin barring and Kimmeridgian evaporite production; erosively-based fluvial sandstones directly overlying offshore marine deposits; closure of the Rocas Verdes oceanic marginal basin; sequential termination of marine conditions in the Domeyko and Neuquen back-arc basins; sudden influx of arc-derived alluvial conglomerates resulting from the onset of contractional tectonics; and an incremental jump in the eastward propagation of the Andean volcanic arc. Discrete contractional episodes in the otherwise extensional Andean active margin were thus driven by the incremental spreading phases of the supercontinent. Associated thermal signatures are recorded near the centre of Gondwana by kimberlite emplacement frequency maxima in southern Africa. Plate tectonic theory emphasises the dynamic interaction between adjacent plates, whereby relative rates of motion can be fixed to either the underriding or overriding plate as a reference frame. With reference to the circum-Gondwana subduction zone, I believe that in the past an overemphasis has been placed on the motions of oceanic plates in the Pacific region, while overlooking the role that the thermal evolution of the Pangean supercontinent played in driving circum-Pangean subduction. Thus, careful sequence stratigraphical analysis of active margin sedimentary basins provides a high resolution record, presently under-utilised in detecting, identifying and analysing global tectonic events in time.

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'Stratigraphy'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles