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Journal articles on the topic 'Graptolites Geology, Stratigraphic Geology, Stratigraphic Geology'

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Published: 4 June 2021

Last updated: 16 February 2022

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1

Pålsson, C. "Upper Ordovician graptolites and biostratigraphy of the Röstånga 1 core,Scania, S. Sweden." Bulletin of the Geological Society of Denmark 49 (December 31, 2002): 9–23. http://dx.doi.org/10.37570/bgsd-2003-49-02.

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A core drilling at Röstånga in 1997, referred to as Röstånga 1, penetrated a significant portion of the Upper Ordovician-Lower Silurian succession in this classical Lower Palaeozoic outcrop area in W central Scania. In descending order the Upper Ordovician of the core embraces the following units (stratigraphic thickness in parenthesis): Lindegård Mudstone (27.8 m), Fjäcka Shale (13.6 m), Mossen Formation (0.6 m), Skagen Formation (0.8 m), and Sularp Formation (19.9 m+). Graptolites are described from the Lindegård Mudstone, the Fjäcka Shale, and the Mossen Formation. The graptolites are class

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Cooper, R. A., and K. Lindholm. "A precise worldwide correlation of early Ordovician graptolite sequences." Geological Magazine 127, no. 6 (1990): 497–525. http://dx.doi.org/10.1017/s0016756800015429.

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AbstractFourteen early Ordovician (Tremadoc-Llandeilo) graptolite sequences from around the world are precisely (infrazonally) correlated, based on the stratigraphic ranges of 130 species and species groups. The composite standard sequence (CSS) of graptolites has been determined from the six best regional sequences by a nonparametric graphic correlation. Two data sets were selected: one comprised first appearance events of 103 taxa, the other, first and last appearance events of 45 taxa. The results of the two runs accord well and reveal respectively 66 and 73 successive bioevents in early Or

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PAGE, ALEX, GUIDO MEINHOLD, DANIEL P. LE HERON, and MOHAMED ELGADRY. "Normalograptus kufraensis, a new species of graptolite from the western margin of the Kufra Basin, Libya." Geological Magazine 150, no. 4 (2013): 743–55. http://dx.doi.org/10.1017/s0016756812000787.

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AbstractNormalograptus kufraensis sp. nov. occurs as monospecific assemblages in the Tanezzuft Formation at the western margin of the Kufra Basin (Jabal Eghei), southern Libya. These graptolites have parallel-sided rhabdosomes with long, straight virgellae, climacograptid thecae and a full straight median septum. N. kufraensis is intermediate between Ordovician graptolites from the N. angustus (Perner) lineage and the younger sister species N. ajjeri (Legrand) and N. arrikini Legrand. N. kufraensis differs from these taxa as follows: it is broader than N. angustus; it has greater thecal spacin

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BERGSTRÖM, STIG M., CHEN XU, BIRGER SCHMITZ, SETH YOUNG, RONG JIA-YU та MATTHEW R. SALTZMAN. "First documentation of the Ordovician Guttenberg δ13C excursion (GICE) in Asia: chemostratigraphy of the Pagoda and Yanwashan formations in southeastern China". Geological Magazine 146, № 1 (2008): 1–11. http://dx.doi.org/10.1017/s0016756808005748.

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AbstractThe only published δ13C data from the Ordovician of China are from the Lower and Upper Ordovician, and only the latter records include a significant excursion, namely the Hirnantian excursion (HICE). Our recent chemostratigraphic work on the Upper Ordovician (Sandbian–Katian) Pagoda and Yanwashan formations at several localities on the Yangtze Platform and Chiangnan (Jiangnan) slope belt has resulted in the recognition of a positive δ13C excursion that has values of ~+1.5‰ above baseline values. This excursion starts a few metres above a stratigraphic interval withB. alobatusSubzone co

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Fan, Junxuan, Xudong Hou, Qing Chen, et al. "Geobiodiversity Database (GBDB) in stratigraphic, palaeontological and palaeogeographic research: graptolites as an example." GFF 136, no. 1 (2014): 70–74. http://dx.doi.org/10.1080/11035897.2014.880070.

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6

Jun-Yuan, Chen, Qian Yi-Yuan, Zhang Jun-Ming, et al. "The recommended Cambrian–Ordovician global Boundary stratotype of the Xiaoyangqiao section (Dayangcha, Jilin Province), China." Geological Magazine 125, no. 4 (1988): 415–44. http://dx.doi.org/10.1017/s0016756800013054.

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AbstractThis paper provides a brief outline of the current, detailed inter-disciplinary work on the Xiaoyangquiao section, trying to expose all the aspects for reference tied to the Global Single Stratigraphic Point (GSSP) Concept for defining the Cambrian–Ordovician Boundary. The 45 m critical interval of this section outcrops very well along the steep bank of a stream and is free from folding, faulting, intrusions, and has not been affected by weathering. Colour alternation of conodonts and acritarchs, and crystallinity indices of illite all indicate a maximum thermal grade of 100 °C. The li

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Berry, William B. N. "Stratigraphic significance of Glyptograptus persculptus group graptolites in central Nevada, U.S.A." Geological Society, London, Special Publications 20, no. 1 (1986): 135–43. http://dx.doi.org/10.1144/gsl.sp.1986.020.01.14.

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Kelling, Gilbert. "Southern Uplands geology: an historical perspective." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 91, no. 3-4 (2000): 323–39. http://dx.doi.org/10.1017/s026359330000821x.

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ABSTRACTFor more than two centuries the rocks of the Southern Uplands have provided successive generations of geologists with both illumination and frustration. This area furnished vital evidence to support Hutton's ideas of petrogenesis and his cyclical view of earth history. However, for much of the succeeding century construction of a credible and consistent stratigraphy and structure eluded the best efforts of the many workers drawn to this region. It was an English-born schoolmaster, Charles Lapworth, inspired by the ideas of foreign practitioners and fascinated by the hitherto-despised g

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9

Štorch, Petr, and Štěpán Manda. "Little known Homerian (lower Silurian) graptolites from kosov quarry near Beroun, the Czech republic." Fossil Imprint 75, no. 1 (2019): 44–58. http://dx.doi.org/10.2478/if-2019-0003.

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Abstract The Homerian graptolite fauna of the upper Cyrtograptus lundgreni and lower Colonograptus ludensis-Colonograptus gerhardi biozones, recovered from densely sampled sections in Kosov quarry includes several poorly known species, which appear to be useful in high resolution correlation. Gothograptus kozlowskii, Gothograptus aff. domeyki, Semigothograptus meganassa, Pristiograptus auctus, Monograptus ambiguus, Monograptus subflexilis and Cyrtograptus hemmanni are described and discussed in detail with reference to their stratigraphic range and palaeogeographic distribution which indicates

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10

Legrand, Philippe. "Faunal specificity, endemism and paleobiogeography: the post-glacial (Hirnantian-early Rhuddanian) graptolite fauna of the North-African border of Gondwana: a case study." Bulletin de la Société Géologique de France 180, no. 4 (2009): 353–67. http://dx.doi.org/10.2113/gssgfbull.180.4.353.

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Abstract Several types of stratigraphic successions are found at the top of the glacial to periglacial “Complexe terminal” forming the uppermost Ordovician of the North-African border of Gondwana. Locally, there may be a progressive transition from microconglomeratic clays (diamictites) with dropstones to more normal marine clays accompanied by the almost immediate reappearance of graptolites. Study of the graptolites has revealed a distinctive composition at the specific level, differing from contemporaneous faunal associations in adjacent regions, which consist of such classical species as “

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Serra, Fernanda, Nicolás A. Feltes, Matías Mango, Miles A. Henderson, Guillermo L. Albanesi, and Gladys Ortega. "Darriwilian (Middle Ordovician) conodonts and graptolites from the Cerro La Chilca Section, Central Precordillera, Argentina." Andean Geology 47, no. 1 (2020): 125. http://dx.doi.org/10.5027/andgeov47n1-3229.

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The Ordovician System is extensively represented in the Precordillera of San Juan Province, Argentina. At the Cerro La Chilca in the Jáchal area, the limestone of the San Juan Formation is paraconformably overlain by interbedded limestone and shale of the Gualcamayo Formation. The present contribution reports new data on the conodont fauna and biostratigraphy of these darriwilian units, revising local and regional chronostratigraphic relationships. New information on the composition of conodont and graptolite associations through the stratigraphic sequence is presented. The presence of Paroist

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White, Chris E., and Sandra M. Barr. "Stratigraphy and depositional setting of the Silurian-Devonian Rockville Notch Group, Meguma terrane, Nova Scotia, Canada." Atlantic Geology 53 (December 19, 2017): 337–65. http://dx.doi.org/10.4138/atlgeol.2017.015.

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The Silurian–Devonian Rockville Notch Group occurs in five separate areas along the northwestern margin of the Meguma terrane of southern Nova Scotia. In each area, the lowermost unit of the group is the White Rock Formation, which unconformably overlies the Lower Ordovician Halifax Group. Early Silurian U–Pb (zircon) dates from metavolcanic rocks in the White Rock Formation indicate that the unconformity represents a depositional gap of about 25 Ma. The U–Pb ages are consistent with early Silurian (Llandovery) trace fossils and sparse shelly faunas in metasedimentary rocks interlayered with t

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Gray, Jane, A. J. Boucot, Yngve Grahn, and Gregory Himes. "A new record of early Silurian land plant spores from the Paraná Basin, Paraguay (Malvinokaffric Realm)." Geological Magazine 129, no. 6 (1992): 741–52. http://dx.doi.org/10.1017/s0016756800008463.

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AbstractThe first conclusive evidence for Silurian rocks in the Paraná Basin, Brazil, was reported in 1985. This evidence was based on organic-walled microfossils, principally spore tetrads, and associated phytoplankton (‘acritarchs’ and prasinophytes), the first recovered from the Vila Maria Formation on the northeastern rim of the Basin. The spore assemblage was typical of Gray's Microfossil Assemblage Zone I; size-frequency data for the tetrads suggested an early Silurian (early Llandovery; Rhuddanian) age. We now document a new MA Zone I occurrence of spore tetrads together with a few sing

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Fordham, Barry G. "Chronometric calibration of mid-Ordovician to Tournaisian conodont zones: a compilation from recent graphic-correlation and isotope studies." Geological Magazine 129, no. 6 (1992): 709–21. http://dx.doi.org/10.1017/s001675680000844x.

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AbstractThree available graphic-correlation analyses are used to calibrate mid-Palaeozoic conodont zonations: Sweet's scheme for the mid- to Upper Ordovician; Kleffner's for the mid- to Upper Silurian; and Murphy & Berry's for the lower and middle Lower Devonian. The scheme of Sweet is scaled by applying the high-precision U-Pb zircon date of Tucker and others for the Rocklandian and linked with that of Kleffner by scaling the graptolite sequence of the Ordovician-Silurian global stratotype section to fit two similarly derived dates from this sequence. The top of Kleffner's scheme, all of

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Lindström, M., T. Flodén, Y. Grahn, and B. Kathol. "Post-impact deposits in Tvären, a marine Middle Ordovician crater south of Stockholm, Sweden." Geological Magazine 131, no. 1 (1994): 91–103. http://dx.doi.org/10.1017/s0016756800010529.

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AbstractThe well-preserved Tvären crater is noteworthy for being one of a small number of Early and Middle Ordovician impact structures formed in a marine environment. It is demonstrated to be an impact structure by the presence of a breccia lens, consisting of crystalline basement rocks, and shocked quartz. The breccia lens formed under dry-hot conditions after expulsion of sea-water by the impact. Resurging sea-water thereupon deposited a positively graded, 60 m thick turbidite-like unit. This graded resurge deposit is a previously unknown feature, to be expected in open-sea impacts. Breccia

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McAdams, Neo E. B., Bradley D. Cramer, Alyssa M. Bancroft, Michael J. Melchin, Joseph A. Devera та James E. Day. "Integrated δ13Ccarb, conodont, and graptolite biochemostratigraphy of the Silurian from the Illinois Basin and stratigraphic revision of the Bainbridge Group". GSA Bulletin 131, № 1-2 (2018): 335–52. http://dx.doi.org/10.1130/b32033.1.

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17

Voldman, Gustavo G., Juan L. Alonso, Luis P. Fernández, et al. "Tips on the SW-Gondwana margin: Ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the Rinconada mélange, Argentine Precordillera." Andean Geology 45, no. 3 (2018): 399. http://dx.doi.org/10.5027/andgeov45n3-3095.

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The Rinconada Formation is a mélange that crops out in the eastern margin of the Argentine Precordillera, an exotic terrane accreted to Gondwana in Ordovician times. Its gravity-driven deposits have been studied by means of conodont and graptolite biostratigraphy, and complemented with stratigraphic analyses. 46 rock samples (85 kg total weight) were obtained from blocks of limestones and of carbonate-cemented quartz-arenites, and from limestone clasts included in conglomerate blocks and debrites. 16 of these samples were productive after standard laboratory acid procedures, yielding 561 conod

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18

Berry, William. "Rudolf Ruedemann: Inheritor of James Hall's Graptolite Legacy." Earth Sciences History 6, no. 1 (1987): 119–24. http://dx.doi.org/10.17704/eshi.6.1.1548504h3771p623.

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James Hall's (1865) Graptolites of the Quebec Group was cited by O. M. B. Bulman as "the first work of real insight" in the study of graptolites. In that work. Hall established standards of excellence in graptolite descriptions and illustrations that future students of graptolites had to match or surpass. Hall also suggested possible phyletic relationships among graptolites and a potential mode of life for them. As well, he reviewed their stratigraphic and geographic distributions. During his career, Hall amassed a large collection of New York graptolites. Only near the end of his career did a

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LOYDELL, D. K. "Graptolite biozone correlation charts." Geological Magazine 149, no. 1 (2011): 124–32. http://dx.doi.org/10.1017/s0016756811000513.

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AbstractCharts are presented showing the correlation of graptolite biozonations for the Lower Ordovician to Lower Devonian, i.e. for the entire stratigraphical range of the planktonic graptoloid graptolites. Regions chosen are those for which the most detailed biostratigraphical studies have been undertaken. For Baltica, average graptolite zone (chron) duration appears to vary fromc. 300000 years (Ludlow Epoch) to 2.4 Ma (Lochkovian Epoch).

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Legrand, Philippe. "Late Ordovician-early Silurian paleogeography of the Algerian Sahara." Bulletin de la Société Géologique de France 174, no. 1 (2003): 19–32. http://dx.doi.org/10.2113/174.1.19.

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Abstract Introduction. It is believed that an inlandsis covered the northern half of the African Gondwana at the end of the Ordovician. After a review of the stratigraphic framework and the methodology used, an attempt is made to reconstruct the successive stages of the advance of the sea at the end of the Ordovician and in the early Silurian in a region believed to have been close to the pole. Only the Algerian Sahara is taken in consideration (fig. 1). Some suggestions are made on the role of the glacio-eustatism in the « Silurian » transgression of the Algerian Sahara. Lithostratigraphy. Be

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Loydell, David K. "Middle Telychian (Llandovery, Silurian) graptolites and biostratigraphy of the Howgill Fells, England, based upon the collections of D.W.R. Wilson housed in the Lapworth Museum of Geology, University of Birmingham." Proceedings of the Yorkshire Geological Society 63, no. 1 (2020): 33–42. http://dx.doi.org/10.1144/pygs2019-014.

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Examination of D.W.R. Wilson's PhD graptolite collection from the Howgill Fells, housed in the Lapworth Museum of Geology, University of Birmingham, reveals a high diversity (23 species) of middle Telychian graptolites from the uppermost Streptograptus crispus and Streptograptus sartorius (and possibly lowermost Monoclimacis griestoniensis) biozones. The collections include the first British records of Pseudoplegmatograptus hexagonalis and Pristiograptus pergratus. The stratigraphical range of P. pristinus is extended upwards, into the sartorius Biozone. One specimen of Stimulograptus clintone

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Sun, Shasha, Linna Zhang, Hongyan Wang, Dazhong Dong, and Rong Zhang. "A new method for predicting the shale distribution of the Wufeng Formation in the Upper Yangtze Region, China." BSGF - Earth Sciences Bulletin 191 (2020): 8. http://dx.doi.org/10.1051/bsgf/2020004.

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Taking the Late Ordovician Wufeng Formation (WFF) shale in the Upper Yangtze region as an example, we conducted a lithofacies distribution, thickness quantification, and paleo-topographic reconstruction of the Late Ordovician graptolite zones. Specifically, we focused on the Late Katian Dicellograptus complexus and the Early Hirnantian Metabolograptus extraordinarius within a chronostratigraphic framework, using the Geographic Information System (GIS) and 310 stratigraphic sections (incl. drilling) obtained from the Geobiodiversity Database (GBDB). Reconstruction of the geographic distribution

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ZALASIEWICZ, J. A., L. TAYLOR, A. W. A. RUSHTON, D. K. LOYDELL, R. B. RICKARDS, and M. WILLIAMS. "Graptolites in British stratigraphy." Geological Magazine 146, no. 6 (2009): 785–850. http://dx.doi.org/10.1017/s0016756809990434.

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Abstract697 taxa of planktonic graptolites are recorded, and their stratigraphical ranges are given, through 60 biozones and subzones in the Ordovician and Silurian strata of England, Wales and Scotland, in the first such stratigraphical compilation for Great Britain since the synthesis of Elles & Wood (1901–1918).

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WILLIAMS, MARK, JEREMY R. DAVIES, RICHARD A. WATERS, ADRIAN W. A. RUSHTON, and PHILIP R. WILBY. "Stratigraphical and palaeoecological importance of Caradoc (Upper Ordovician) graptolites from the Cardigan area, southwest Wales." Geological Magazine 140, no. 5 (2003): 549–71. http://dx.doi.org/10.1017/s0016756803008057.

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Graptolites from more than 60 horizons in the basinal Caradoc succession of southwest Wales, between Fishguard and Cardigan, allow recognition of the multidens, clingani and linearis biozones. The biostratigraphy permits recognition of major differences in the sedimentary rock-sequence north and south of structures associated with the Fishguard–Cardigan Fault Belt. The Penyraber Mudstone Formation, disconformably overlying the Fishguard Volcanic Group (Llanvirn), is partly of multidens Biozone age. It is succeeded south of the Newport Sands Fault by the Cwm yr Eglwys Mudstone Formation of clin

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RUSHTON, ADRIAN, MARK WILLIAMS, NGUYEN DUC PHONG, et al. "Early Ordovician (Tremadocian and Floian) graptolites from the Than Sa Formation, northeast Vietnam." Geological Magazine 155, no. 7 (2017): 1442–48. http://dx.doi.org/10.1017/s0016756817000310.

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AbstractThe lower Palaeozoic marine succession of NE Vietnam accumulated on the South China plate. Despite historical works dating to French colonial times, the stratigraphy and palaeontology of the succession is poorly constrained. Chief amongst the lower Palaeozoic lithostratigraphical divisions is the Than Sa Formation, a c. 1200 m thick succession of clastic rocks of Cambrian and early Ordovician age. Newly collected graptolites (including Rhabdinopora? sp. and Tetragraptus approximatus) from the upper part of the formation identify strata assignable to the Tremadocian and Floian stages of

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MULLINS, G. L., and D. K. LOYDELL. "Integrated lower Silurian chitinozoan and graptolite biostratigraphy of Buttington Brick Pit, Wales." Geological Magazine 139, no. 1 (2002): 89–96. http://dx.doi.org/10.1017/s001675680100591x.

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The chitinozoans recovered from six graptolitic horizons in the Buttington Brick Pit, Wales, are described. A correlation between the upper Llandovery and lower Wenlock chitinozoan and graptolite biostratigraphical schemes is presented. These data are compared with the recently refined chitinozoan biostratigraphical scheme in the nearby Banwy River section, Wales. Chitinozoans from definite turriculatus graptolite Biozone strata are described for the first time from the UK. Chitinozoans indicative of the Eisenackitina dolioliformis Biozone occur in the turriculatus Biozone, although the base o

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Visher, Glenn S. "Stratigraphic sequences." Leading Edge 22, no. 12 (2003): 1212–17. http://dx.doi.org/10.1190/1.1641373.

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Masuda, Fujio. "The geology of stratigraphic sequence." Sedimentary Geology 116, no. 3-4 (1998): 279–80. http://dx.doi.org/10.1016/s0037-0738(97)00108-5.

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LOYDELL, D. K., and V. NESTOR. "Integrated graptolite and chitinozoan biostratigraphy of the upper Telychian (Llandovery, Silurian) of the Ventspils D-3 core, Latvia." Geological Magazine 142, no. 4 (2005): 369–76. http://dx.doi.org/10.1017/s0016756805000531.

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Integrated graptolite and chitinozoan biostratigraphical data are presented from the upper Telychian (Oktavites spiralis and Cyrtograptus lapworthi graptolite biozones) of the Ventspils D-3 core, Latvia. The base of the Angochitina longicollis chitinozoan Biozone is approximately coincident with that of the spiralis graptolite Biozone, as it is elsewhere in the East Baltic, although in Wales it lies within the upper spiralis graptolite Biozone. Conochitina proboscifera appears in the upper spiralis graptolite Biozone in the Ventspils D-3 core, but at lower and higher horizons elsewhere, presum

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Zhang, Yuandong, Bernd-D. Erdtmann, and Hongzhen Feng. "Tremadocian (Early Ordovician) graptolite biostratigraphy of China." Newsletters on Stratigraphy 40, no. 3 (2004): 155–82. http://dx.doi.org/10.1127/0078-0421/2004/0040-0155.

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Tipper, John C. "Estimating Stratigraphic Completeness." Journal of Geology 95, no. 5 (1987): 710–15. http://dx.doi.org/10.1086/629166.

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LOYDELL, D. K., G. N. SARMIENTO, P. ŠTORCH, and J. C. GUTIÉRREZ-MARCO. "Graptolite and conodont biostratigraphy of the upper Telychian–lower Sheinwoodian (Llandovery–Wenlock) strata, Jabalón River section, Corral de Calatrava, central Spain." Geological Magazine 146, no. 2 (2008): 187–98. http://dx.doi.org/10.1017/s0016756808005840.

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AbstractA graptolite biostratigraphy is erected for the upper Telychian (upper crenulata Biozone) to lower Sheinwoodian (riccartonensis or dubius Biozone) strata of the Jabalón River section, Spain. Two unconformities are recognized in the section: one between the lapworthi and murchisoni biozones; the other between the murchisoni and riccartonensis biozones. These unconformities coincide with intervals of lowered eustatic sea-level. Graptolite assemblages include both cosmopolitan taxa and some which have been recorded previously from Morocco and/or other Spanish sections. At some stratigraph

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Tipper, J. C. "Patterns of Stratigraphic Cyclicity." Journal of Sedimentary Research 70, no. 6 (2000): 1262–79. http://dx.doi.org/10.1306/031700701262.

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Shaw, Alan B., and F. X. Miller. "Quantitative Stratigraphic Correlation." Sedimentary Geology 45, no. 3-4 (1985): 316–17. http://dx.doi.org/10.1016/0037-0738(85)90009-0.

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Cooper, A. H., A. W. A. Rushton, S. G. Molyneux, R. A. Hughes, R. M. Moore, and B. C. Webb. "The stratigraphy, correlation, provenance and palaeogeography of the Skiddaw Group (Ordovician) in the English Lake District." Geological Magazine 132, no. 2 (1995): 185–211. http://dx.doi.org/10.1017/s0016756800011742.

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AbstractA new lithostratigraphy is presented for the Skiddaw Group (lower Ordovician) of the English Lake District. Two stratigraphical belts are described. Five formations are defined in the Northern Fells Belt, ranging in age from Tremadoc to early Llanvirn. They are all mudstone or sandstone dominated, of turbidite origin; in ascending order they are named the Bitter Beck, Watch Hill, Hope Beck, Loweswater and Kirk Stile formations. Two formations are defined in the Central Fells Belt, ranging in age from late Arenig to Llanvirn. These are the Buttermere Formation – a major olistostrome dep

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Tipper, J. C. "Techniques for quantitative stratigraphic correlation: a review and annotated bibliography." Geological Magazine 125, no. 5 (1988): 475–94. http://dx.doi.org/10.1017/s0016756800013224.

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AbstractThe development of techniques for quantitative stratigraphic correlation has tended to outstrip their acceptance by practising stratigraphers. To make these techniques more readily accessible and to encourage their use, this paper presents a brief, general review of the problem of quantitative stratigraphic correlation and then shows how, using a natural framework for stratigraphic correlation, the stratigraphic time-series, there can be seen an orderly pattern among them. The annotated bibliography, of almost 400 articles, includes a majority of those references concerned with quantit

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Bailey, R. J., and D. G. Smith. "Quantitative tests for stratigraphic cyclicity." Geological Journal 43, no. 4 (2008): 431–46. http://dx.doi.org/10.1002/gj.1115.

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Barnes, C. R. "The proposed Cambrian–Ordovician global Boundary stratotype and point (GSSP) in Western Newfoundland, Canada." Geological Magazine 125, no. 4 (1988): 381–414. http://dx.doi.org/10.1017/s0016756800013042.

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AbstractSections exposing the Cambrian–Ordovician Boundary interval at Broom Point in western Newfoundland have been proposed earlier for a global systemic boundary stratotype. These lie within the Cow Head Group, a late Middle Cambrian to early Middle Ordovician allochthonous unit of limestone, shale, and conglomerate deposited at the toe of the ancient continental slope and on the adjacent continental rise. Several recent studies have further investigated the stratigraphy, sedimentology, and palaeontology of the Cow Head Group and others are under way on magnetostratigraphy and chemostratigr

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MOLYNEUX, S. G., E. RAEVSKAYA, and T. SERVAIS. "The messaoudensis–trifidum acritarch assemblage and correlation of the base of Ordovician Stage 2 (Floian)." Geological Magazine 144, no. 1 (2006): 143–56. http://dx.doi.org/10.1017/s0016756806002676.

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The Global Stratotype Section and Point (GSSP) for Stage 2 of the Ordovician System, now the Floian Stage and approximately equivalent to the lower and middle Arenig of England and Wales, is defined by the first appearance datum (FAD) of the graptolite Tetragraptus approximatus in the Diabasbrottet Quarry section at Mount Hunneberg, Sweden. One of the issues this raises is how to correlate the base of Stage 2 at the GSSP with areas and successions that do not contain a correlative graptolite fauna. The distinctive Cymatiogalea messaoudensis–Stelliferidium trifidum acritarch assemblage is prese

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Koren, T., and M. Bjerreskov. "Early Llandovery monograptids from Bornholm and the southern Urals: taxonomy and evolution." Bulletin of the Geological Society of Denmark 44 (March 15, 1998): 1–43. http://dx.doi.org/10.37570/bgsd-1998-44-01.

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The most complete Lower Llandovery succession of mudrocks yielding graptolites within the ascensus, acuminatus and vesiculosus Biozones was studied in the Billegrav-1 core, South Bornholm. Special attention is given to the taxonomy and stratigraphical ranges of monograptids found in the vesiculosus Biozone in the core and nearby exposures in Øle Å. Monograptids of the ascensus-acuminatus and vesiculosus Biozones were also discovered in condensed carbonaceous shale sequences of the Sakmara Formation in the southern Urals. Monograptids from Bornholm and the southern Urals are described, and refe

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Toro, Blanca A., Susana E. Heredia, Nexxys C. Herrera Sánchez, and Florencia Moreno. "First Middle Ordovician conodont record related to key graptolites from the western Puna, Argentina: perspectives for an integrated biostratigraphy and correlation of the Central Andean Basin." Andean Geology 47, no. 1 (2020): 144. http://dx.doi.org/10.5027/andgeov47n1-3261.

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Recent biostratigraphic studies on the western argentine Puna recorded the Middle Ordovician conodont Baltoniodus cf. B. navis (Lindström) for first time, related to key graptolite taxa of the Central Andean Basin. The analyzed material comes from the lower and middle thirds of the turbidite succession exposed at the Huaytiquina section, Salta Province, which was previously assigned to the “Coquena” Formation. The conodont fauna was recovered from the calcareous sandstone beds intercalated in the middle portion of this unit, and it is composed by species of the genera Baltoniodus, Gothodus, Tr

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Evans, G. "Stratigraphic sequences and their chronostratigraphic correlation." Journal of Sedimentary Research 63, no. 2 (1993): 304–5. http://dx.doi.org/10.1306/d4267aeb-2b26-11d7-8648000102c1865d.

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Heinberg, Claus. "Morphotype biostratigraphy, diachronism, and bivalve recovery in the earliest Danian of Denmark." Bulletin of the Geological Society of Denmark 52 (December 31, 2005): 81–95. http://dx.doi.org/10.37570/bgsd-2005-52-07.

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Morphotype ratios among planktonic foraminifers are used as a stratigraphic tool within the Cerithium Limestone, part of the lowermost Danian type sequence at Stevns Klint, Denmark. Enhanced stratigraphic resolution provided by the method indicates that the base of the limestone is diachronous, becoming progressively younger northwards. The bivalve fauna of the Cerithium Limestone represents an early recovery fauna exhibiting a gradual recovery pattern from zero species at the stratigraphic base of the limestone to a rather constant level about 20 species through the upper half of the unit. A

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Miall, Andrew D., John M. Holbrook, and Janok P. Bhattacharya. "The Stratigraphy Machine." Journal of Sedimentary Research 91, no. 6 (2021): 595–610. http://dx.doi.org/10.2110/jsr.2020.143.

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ABSTRACT There is a significant difference between the average sedimentation rate of a lengthy stratigraphic section spanning many millions of years, and the rate that can be calculated from any short segment within such a section, such segments typically yielding rates several orders of magnitude more rapid than the overall rate. Stratigraphic successions contain numerous surfaces of nondeposition and erosion representing time spans from minutes to many millions of years, which collectively may account for as much as 90% of the total elapsed time that the succession represents. The stratigrap

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Buselli, G. "Stratigraphic mapping applications of TEM." Exploration Geophysics 16, no. 2-3 (1985): 177–79. http://dx.doi.org/10.1071/eg985177.

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Vining, B. "Caprocks: stratigraphic and mechanical considerations." Marine and Petroleum Geology 10, no. 1 (1993): 2. http://dx.doi.org/10.1016/0264-8172(93)90094-9.

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Diessel, Claus F. K. "The stratigraphic distribution of inertinite." International Journal of Coal Geology 81, no. 4 (2010): 251–68. http://dx.doi.org/10.1016/j.coal.2009.04.004.

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DILL, H., and H. NIELSEN. "Carbon-sulphur-iron-variations and sulphur isotope patterns of Silurian Graptolite Shales." Sedimentology 33, no. 5 (1986): 745–55. http://dx.doi.org/10.1111/j.1365-3091.1986.tb01973.x.

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SHLEMON, R. J. "Application of Soil-Stratigraphic Techniques to Engineering Geology." Environmental & Engineering Geoscience xxii, no. 2 (1985): 129–42. http://dx.doi.org/10.2113/gseegeosci.xxii.2.129.

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Alavi, Mehdi, and M. A. Mahdavi. "Stratigraphy and structures of the Nahavand region in western Iran, and their implications for the Zagros tectonics." Geological Magazine 131, no. 1 (1994): 43–47. http://dx.doi.org/10.1017/s0016756800010475.

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AbstractSeveral rock stratigraphic successions, metamorphosed and non-metamorphosed, are found to be similar and/or identical with each other across the so-called ‘Main Zagros Thrust’. Stratigraphic successions form thin allochthonous sheets carried from northeast to southwest by numerous low-angle thrust faults of either ductile to brittle-ductile type or brittle type. Similarities in lithic and faunal characteristics of the stratigraphic units and in the style of structural deformation across the ‘Main Zagros Thrust’ imply that either the suture between the Afro-Arabian and Iranian lithosphe

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