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Artículos de revistas sobre el tema "Stratigraphic Eocene"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 31 de enero de 2023

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1

Williamson, P. E., C. J. Pigram, J. B. Colwell, A. S. Scherl, K. L. Lockwood, and J. C. Branson. "PRE-EOCENE STRATIGRAPHY, STRUCTURE, AND PETROLEUM POTENTIAL OF THE BASS BASIN." APPEA Journal 25, no. 1 (1985): 362. http://dx.doi.org/10.1071/aj84031.

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Exploration in the Bass Basin has mainly concentrated on the Eocene part of the Eastern View Coal Measures with the pre-Eocene stratigraphy hardly being tested. Structural mapping using a good quality Bureau of Mineral Resources regional seismic survey and infill industry seismic data, in conjunction with seismic stratigraphy and well data, has generated an understanding of the structure and stratigraphy of the pre- Eocene basin, which suggests that exploration potential exists in structural and stratigraphic leads of both Paleocene and Cretaceous age.The Paleocene structure is influenced by t

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2

Wade, Bridget S., Mohammed H. Aljahdali, Yahya A. Mufrreh, Abdullah M. Memesh, Salih A. AlSoubhi, and Iyad S. Zalmout. "Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges." Journal of Micropalaeontology 40, no. 2 (September 28, 2021): 145–61. http://dx.doi.org/10.5194/jm-40-145-2021.

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Abstract. The Rashrashiyah Formation of the Sirhan Basin in northern Saudi Arabia contains diverse assemblages of planktonic foraminifera. We examined the biostratigraphy, stratigraphic range and preservation of upper Eocene planktonic foraminifera. Assemblages are well-preserved and diverse, with 40 species and 11 genera. All samples are assigned to the Priabonian Globigerinatheka semiinvoluta Highest Occurrence Zone (E14), consistent with calcareous nannofossil biostratigraphy indicating Zone CNE17. Well-preserved planktonic foraminifera assemblages from the lower part of the upper Eocene ar

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3

Eberle, Jaelyn J., and David A. Eberth. "Additions to the Eocene Perissodactyla of the Margaret Formation, Eureka Sound Group, Ellesmere Island, Arctic Canada." Canadian Journal of Earth Sciences 52, no. 2 (February 2015): 123–33. http://dx.doi.org/10.1139/cjes-2014-0195.

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We describe early Eocene (Wasatchian) occurrences of the isectolophid Homogalax, tapiroids Heptodon posticus, Heptodon cf. H. posticus, and Heptodon sp., as well as early middle Eocene (Bridgerian) fossils of the brontothere Palaeosyops from localities in the Margaret Formation of the Eureka Sound Group on Ellesmere Island, Nunavut, Arctic Canada. Their occurrence on Ellesmere Island considerably extends the geographic range of these taxa, previously known from mid-latitude localities in British Columbia (only Heptodon), the Western Interior of the United States, and Asia (Homogalax, Heptodon,

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4

Reinhardt, Lutz, Werner von Gosen, Andreas Lückge, Martin Blumenberg, Jennifer M. Galloway, Christopher K. West, Markus Sudermann, and Martina Dolezych. "Geochemical indications for the Paleocene-Eocene Thermal Maximum (PETM) and Eocene Thermal Maximum 2 (ETM-2) hyperthermals in terrestrial sediments of the Canadian Arctic." Geosphere 18, no. 1 (January 7, 2022): 327–49. http://dx.doi.org/10.1130/ges02398.1.

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Abstract During the late Paleocene to early Eocene, clastic fluvial sediments and coals were deposited in northern high latitudes as part of the Margaret Formation at Stenkul Fiord (Ellesmere Island, Nunavut, Canada). Syn-sedimentary tectonic movements of the Eurekan deformation continuously affected these terrestrial sediments. Different volcanic ash layers occur, and unconformities subdivide the deposits into four sedimentary units. Rare vertebrate fossils indicate an early Eocene (Graybullian) age for the upper part of the Stenkul Fiord outcrop. Here, we present carbon isotope data of bulk

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5

Mitrovic-Petrovic, Jovanka. "Paleoecological features and stratigraphic significance of the Genus Conoclypus, Echinoidea." Annales g?ologiques de la Peninsule balkanique, no. 64 (2002): 89–105. http://dx.doi.org/10.2298/gabp0264089m.

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Five species and a subspecies of the genus Conoclypus from Eocene formations of Croatia and Herzegovina are presented in this paper. Morphology of the genus is analysed. The given paleoecological conclusions are based on morphological data, character of sedimentary rocks containing Conoclypus, associated fauna and mechanical and biotic damages. Stratigraphic significance of this genus is emphasized, because it appeared, flourished, and disappeared in the Eocene period.

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6

Birgenheier, L. P., M. D. Vanden Berg, P. Plink-Björklund, R. D. Gall, E. Rosencrans, M. J. Rosenberg, L. C. Toms, and J. Morris. "Climate impact on fluvial-lake system evolution, Eocene Green River Formation, Uinta Basin, Utah, USA." GSA Bulletin 132, no. 3-4 (June 19, 2019): 562–87. http://dx.doi.org/10.1130/b31808.1.

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Abstract In light of a modern understanding of early Eocene greenhouse climate fluctuations and new highly seasonal fluvial system faces models, the role of climate in the evolution of one classically-cited continental, terminal lake system is re-examined. Detailed stratigraphic description and elemental abundance data from fifteen cores and seven outcrop regions of the Green River Formation were used to construct a ∼150 km cross section across the Uinta Basin, Utah, USA. Lake Uinta in the Uinta Basin is divided into five lake phases: (1) post-Paleocene Eocene Thermal Maximum, (2) peak Eocene

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7

Siyako, M., and O. Huvaz. "Eocene stratigraphic evolution of the Thrace Basin, Turkey." Sedimentary Geology 198, no. 1-2 (May 2007): 75–91. http://dx.doi.org/10.1016/j.sedgeo.2006.11.008.

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8

Higgs, Karen E., Stuart Munday, Anne Forbes, Erica M. Crouch, and Matthew W. Sagar. "A geochemical and biostratigraphic approach to investigating regional changes in sandstone composition through time; an example from Paleocene–Eocene strata, Taranaki Basin, New Zealand." Geological Magazine 157, no. 9 (February 17, 2020): 1473–98. http://dx.doi.org/10.1017/s0016756819001596.

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AbstractA geochemical and biostratigraphic approach has been applied to investigate the spatial and stratigraphic variability of Palaeogene sandstones from key wells in Taranaki Basin, New Zealand. Chronostratigraphic control is predominantly based on miospore zonation, while differences in the composition of Paleocene and Eocene sandstones are supported by geochemical evidence. Stratigraphic changes are manifested by a significant decrease in Na2O across the New Zealand miospore PM3b/MH1 early Eocene zonal boundary, at approximately 53.5 Ma. The change in Na2O is associated with a decrease in

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9

Venkatachala, B. S., C. Caratini, C. Tissot, and R. K. Kar. "Palaeocene-Eocene marker pollen from India and tropical Africa." Journal of Palaeosciences 37, no. (1-3) (December 31, 1988): 1–25. http://dx.doi.org/10.54991/jop.1988.1595.

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The Palaeocene-Eocene epochs have witnessed a great floral diversification in tropical areas, which is also reflected in the pollen spectra. The important Indian stratigraphical marker taxa have been examined and a comparative study with extant material has provided botanical affinities to some of the taxa. Their comparison with those recorded in Africa leads to reflection on their palaeogeographical distribution. The stratigraphic ranges have been shown in the range chart. Some of the taxa common to India and Africa are: Retistephanocolpites williamsi, Spinizonocolpites spp., Tricolpites reti

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10

Carter, Burchard D., and Michael L. McKinney. "Eocene echinoids, the Suwannee Strait, and biogeographic taphonomy." Paleobiology 18, no. 3 (1992): 299–325. http://dx.doi.org/10.1017/s0094837300010861.

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Faunal similarity among regions is often used as a means of identifying regions of endemism in fossil faunas. At least two large-scale taphonomic effects can affect apparent faunal similarity: stratigraphic and facies mismatching. In stratigraphic mismatching, an unconformity represents removal of most or all of a complete assemblage zone in one region, and the constituent taxa are mistakenly interpreted as having never inhabited that region. In facies mismatching, environmental differences between two regions (possibly unrecognized) cause the inference of a barrier that never existed. The two

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11

de Santana dos Anjos Zerfass, Geise, Dmitry A. Ruban, Farid Chemale Jr., and Henrique Zerfass. "Cenozoic synthem stratigraphic architecture of the SE Brazilian shelf and its global eustatic context: evidence from the Pelotas Basin (offshore Brazil)." Geologos 19, no. 4 (December 1, 2013): 273–90. http://dx.doi.org/10.2478/logos-2013-0018.

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Abstract The Pelotas Basin, located on the SE Brazilian shelf, has evolved since the Aptian. Stratigraphical data from the basin can be used for delineation of the unconformity-bounded units (synthems) on the shelf, which is a first step towards a full understanding of its stratigraphic architecture, evolution, and hydrocarbon potential. Hiatuses in the Cenozoic succession of the Pelotas Basin are established with both biostratigraphic (planktonic foraminifers and calcareous nannofossils) and isotopic (87Sr/86Sr) data. The seven recognised hiatuses are dated respectively as (1) Palaeocene (Dan

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12

Siddiqui, Qadeer A. "The ostracod genus <i>Paijenborchella</i> and some of its species in the Early Tertiary of Pakistan." Journal of Micropalaeontology 25, no. 1 (April 1, 2006): 65–72. http://dx.doi.org/10.1144/jm.25.1.65.

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Abstract. Six species of the genus Paijenborchella are described. Five of these species are new, namely Paijenborchella (Eopaijenborchella) angulosa, P. (E.) viriosa, P. (E.) ventricaudata, P. (E.) noar and P. (Paijenborchella) inponticulata. The stratigraphic distribution of these species in the Early Tertiary of Pakistan is given; they range from the Lower Eocene to the Upper Eocene in the Sulaiman Range and one species occurs in the Upper Paleocene of the Sor Range.

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13

Riddell, Janet. "Lithostratigraphic and tectonic framework of Jurassic and Cretaceous Intermontane sedimentary basins of south-central British Columbia1This article is one of a series of papers published in this Special Issue on the theme of New insights in Cordilleran Intermontane geoscience: reducing exploration risk in the mountain pine beetle-affected area, British Columbia." Canadian Journal of Earth Sciences 48, no. 6 (June 2011): 870–96. http://dx.doi.org/10.1139/e11-034.

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The south-central Intermontane belt of British Columbia has a complex architecture comprising late Paleozoic to Mesozoic volcanic and plutonic arc magmatic suites, marine and nonmarine clastic basins, high-grade metamorphic complexes, and accretionary rocks. Jurassic and Cretaceous clastic basins within this framework contain stratigraphy with hydrocarbon potential. The geology is complicated by Cretaceous to Eocene deformation, dismemberment, and dislocation. The Eocene to Neogene history of the southern Intermontane belt is dominated by non-arc volcanism, followed by Pleistocene to Recent gl

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14

Frieling, Joost, Emiel P. Huurdeman, Charlotte C. M. Rem, Timme H. Donders, Jörg Pross, Steven M. Bohaty, Guy R. Holdgate, Stephen J. Gallagher, Brian McGowran, and Peter K. Bijl. "Identification of the Paleocene–Eocene boundary in coastal strata in the Otway Basin, Victoria, Australia." Journal of Micropalaeontology 37, no. 1 (February 13, 2018): 317–39. http://dx.doi.org/10.5194/jm-37-317-2018.

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Abstract. Detailed, stratigraphically well-constrained environmental reconstructions are available for Paleocene and Eocene strata at a range of sites in the southwest Pacific Ocean (New Zealand and East Tasman Plateau; ETP) and Integrated Ocean Discovery Program (IODP) Site U1356 in the south of the Australo-Antarctic Gulf (AAG). These reconstructions have revealed a large discrepancy between temperature proxy data and climate models in this region, suggesting a crucial error in model, proxy data or both. To resolve the origin of this discrepancy, detailed reconstructions are needed from both

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15

Luan, Xiwu, and Peter Lunt. "Eocene to Miocene stratigraphic controls in the far East Java Sea: Implications for stratigraphic studies." Marine Geology 436 (June 2021): 106479. http://dx.doi.org/10.1016/j.margeo.2021.106479.

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16

Galeotti, Simone, Eugenia Angori, Rodolfo Coccioni, Gabriella Ferrari, Bruno Galbrun, Simonetta Monechi, Isabella Premoli Silva, Robert Speijer, and Bruno Turi. "Integrated stratigraphy across the Paleocene/Eocene boundary in the Contessa Road section, Gubbio (central Italy)." Bulletin de la Société Géologique de France 171, no. 3 (May 1, 2000): 355–65. http://dx.doi.org/10.2113/171.3.355.

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Abstract An integrated stratigraphic study of the upper Paleocene to lower Eocene Scaglia limestones of the Contessa Road section has allowed us to identify the classical markers of the Paleocene-Eocene transition. The section provides a good magnetostratigraphic record as well as a continuous calcareous nannofossil and foraminiferal biostratigraphy. A negative Carbon Isotopic Excursion (CIE) occurs in the lower part of Chron C24r. The calibration to calcareous plankton zonation indicates that the CIE occurs in the lowermost part of calcareous nannofossil Zone NP10 and the upper part of Zone C

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17

Rivandi, Batool, Mohammad Vahidinia, Mehdi Nadjafi, Asadollah Mahboubi, and Abbas Sadeghi. "Biostratigraphy and Sequence Stratigraphy of Paleogene Deposits in Central Kopet-Dagh Basin (NE of Iran)." Journal of Geological Research 2013 (September 15, 2013): 1–12. http://dx.doi.org/10.1155/2013/892198.

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In this paper, the biostratigraphy and sequence stratigraphy of marine Paleogene deposits from the Kopet-Dagh basin (NE of Iran) are described. Particularly the absence of Morozovella genus is discussed. In addition, the Paleocene/Eocene boundary has been studied in detail using the record of planktonic and larger benthic foraminifera. This boundary is located probably within a thin red horizon (~10–15 cm) representing a paleosoil. Close to this boundary is located the base of the calcareous test dissolution interval, with the dominance of agglutinated benthic foraminifera and with a sudden de

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18

Siddiqui, Qadeer A. "Some species of the genus <i>Neocyprideis</i> in the early Tertiary of Pakistan." Journal of Micropalaeontology 19, no. 1 (May 1, 2000): 1–7. http://dx.doi.org/10.1144/jm.19.1.1.

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Abstract. Four species of the genus Neocyprideis described in this paper are an addition to the ostracod fauna from the early Tertiary of Pakistan. N. sp. A occurs in the Upper Palaeocene of the Sor Range, and three new species are found in the Eocene of the Sulaiman Range. The new species are Neocyprideis simplex and N. regularis from the upper Lower Eocene, and N. formosa from the uppermost Eocene. The first two species, the associated ostracod fauna and the lithology suggest a shallow marine shelf environment with evaporitic conditions, while N. formosa lived in an open marine shelf environ

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19

Westerhold, T., U. Röhl, H. Pälike, R. Wilkens, P. A. Wilson, and G. Acton. "Orbitally tuned timescale and astronomical forcing in the middle Eocene to early Oligocene." Climate of the Past 10, no. 3 (May 16, 2014): 955–73. http://dx.doi.org/10.5194/cp-10-955-2014.

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Abstract. Deciphering the driving mechanisms of Earth system processes, including the climate dynamics expressed as paleoceanographic events, requires a complete, continuous, and high-resolution stratigraphy that is very accurately dated. In this study, a robust astronomically calibrated age model was constructed for the middle Eocene to early Oligocene interval (31–43 Ma) in order to permit more detailed study of the exceptional climatic events that occurred during this time, including the middle Eocene climate optimum and the Eocene–Oligocene transition. A goal of this effort is to accuratel

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20

Westerhold, T., U. Röhl, H. Pälike, R. Wilkens, P. A. Wilson, and G. Acton. "Orbitally tuned time scale and astronomical forcing in the middle Eocene to early Oligocene." Climate of the Past Discussions 9, no. 6 (December 18, 2013): 6635–82. http://dx.doi.org/10.5194/cpd-9-6635-2013.

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Abstract. Deciphering the driving mechanisms of Earth system processes, including the climate dynamics expressed as paleoceanographic events, requires a complete, continuous, and high-resolution stratigraphy that is very accurately dated. In this study, we construct a robust astronomically calibrated age model for the middle Eocene to early Oligocene interval (31–43 Ma) in order to permit more detailed study of the exceptional climatic events that occurred during this time, including the Middle Eocene Climate Optimum and the Eocene/Oligocene transition. A goal of this effort is to accurately d

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21

Arditto, P. A. "THE EASTERN OTWAY BASIN WANGERRIP GROUP REVISITED USING AN INTEGRATED SEQUENCE STRATIGRAPHIC METHODOLOGY." APPEA Journal 35, no. 1 (1995): 372. http://dx.doi.org/10.1071/aj94024.

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Recent exploration by BHP Petroleum in VIC/ P30 and VIC/P31, within the eastern Otway Basin, has contributed significantly to our understanding of the depositional history of the Paleocene to Eocene siliciclastic Wangerrip Group. The original lithostratigraphic definition of this group was based on outcrop description and subsequently applied to onshore and, more recently, offshore wells significantly basinward of the type sections. This resulted in confusing individual well lithostratigraphies which hampered traditional methods of subsurface correlation.A re-evaluation of the Wangerrip Group

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22

Stoykova, Kristalina, and Marin Ivanov. "New data on the age of the Emine Formation (East Balkan, Bulgaria)." Review of the Bulgarian Geological Society 82, no. 3 (December 2021): 126–28. http://dx.doi.org/10.52215/rev.bgs.2021.82.3.126.

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The study represents new data about chronostratigraphic range of the Emine flysch Formation in its type section at the Black Sea coast near the “Irakli” touristic resort. In the highest stratigraphic levels, calcareous nannofossils of NP 10 Rhomboaster bramlettei zone have been documented, supporting early Eocene age for the formation. These new finds will shed light on the timing of cessation of the turbiditic sedimentation in East Balkan, as well as on the specific expression of the global event – the Paleocene–Eocene Thermal Maximum (PETM) in deep-water environment.

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23

Cotton, Laura J., Wolfgang Eder, and James Floyd. "Larger foraminifera of the Devil's Den and Blue Hole sinkholes, Florida." Journal of Micropalaeontology 37, no. 1 (March 23, 2018): 347–56. http://dx.doi.org/10.5194/jm-37-347-2018.

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Abstract. Shallow-water carbonate deposits are well-known from the Eocene of the US Gulf Coast and Caribbean. These deposits frequently contain abundant larger benthic foraminifera (LBF). However, whilst integrated stratigraphic studies have helped to refine the timing of LBF overturning events within the Tethys and Indo-Pacific regions with respect to global bio- and chemo-stratigraphic records, little recent work has been carried out in the Americas. The American LBF assemblages are distinctly different from those of Europe and the Indo-Pacific. It is therefore essential that the American bi

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24

Nielsen, Jan Kresten. "Commensal association of Corbula gibba (Bivalvia) and a sub-conical boring." Bulletin of the Geological Society of Denmark 45 (January 30, 1999): 135–38. http://dx.doi.org/10.37570/bgsd-1998-45-15.

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An examination of fossil and Recent right valves of the infaunal, suspensionfeeding Corbula gibba (Olivi, 1792) revealed the presence of a slender, sub- conical, unbranched boring. The boring is interpreted as the work of a commensal organism, possible a parasite. Stratigraphic range is from Eocene to Recent.

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25

Greenwood, David R., and James F. Basinger. "Stratigraphy and floristics of Eocene swamp forests from Axel Heiberg Island, Canadian Arctic Archipelago." Canadian Journal of Earth Sciences 30, no. 9 (September 1, 1993): 1914–23. http://dx.doi.org/10.1139/e93-169.

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A record of polar Eocene forests is preserved as in situ tree-stump fields and leaf-litter mats in Buchanan Lake Formation sediments on Axel Heiberg Island, in the Canadian Arctic Archipelago. Stratigraphic examination at the centimetre to metre scale of peat–coal lithology and macrofossil floristics in two levels of these fossil forests reflects small-scale changes in forest composition and swamp hydrology horizontally and temporal variation vertically. Root system structure and tree base stratigraphy suggest that exposed tree stumps may not include only coeval individuals of a single forest

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26

Arua, I., and V. R. Rao. "New stratigraphic data on the Eocene Ameki formation, southeastern Nigeria." Journal of African Earth Sciences (1983) 6, no. 4 (January 1987): 391–97. http://dx.doi.org/10.1016/0899-5362(87)90082-0.

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27

Chukova, E. I., A. S. Rakhmatullina, and O. V. Sivalneva. "The Lithology of the Eocene-Paleocene Reservoirs of the Central and Eastern Ciscaucasia." E3S Web of Conferences 266 (2021): 07002. http://dx.doi.org/10.1051/e3sconf/202126607002.

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The article presents the results of lithological and petrophysical investigations of reservoir rocks of the Eocene-Paleocene Formations, which is one of the main hydrocarbon prolific horizons in the Central and Eastern Ciscaucasia. These results include lithological characteristics and pore space parameters for reservoir rocks of these stratigraphic intervals.

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28

Steinthorsdottir, Margret, Amanda S. Porter, Aidan Holohan, Lutz Kunzmann, Margaret Collinson, and Jennifer C. McElwain. "Fossil plant stomata indicate decreasing atmospheric CO<sub>2</sub> prior to the Eocene–Oligocene boundary." Climate of the Past 12, no. 2 (February 25, 2016): 439–54. http://dx.doi.org/10.5194/cp-12-439-2016.

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Abstract. A unique stratigraphic sequence of fossil leaves of Eotrigonobalanus furcinervis (extinct trees of the beech family, Fagaceae) from central Germany has been used to derive an atmospheric pCO2 record with multiple data points spanning the late middle to late Eocene, two sampling levels which may be earliest Oligocene, and two samples from later in the Oligocene. Using the inverse relationship between the density of stomata and pCO2, we show that pCO2 decreased continuously from the late middle to late Eocene, reaching a relatively stable low value before the end of the Eocene. Based o

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29

Steinthorsdottir, M., A. S. Porter, A. Holohan, L. Kunzmann, M. Collinson, and J. C. McElwain. "Fossil plant stomata indicate decreasing atmospheric CO<sub>2</sub> prior to the Eocene–Oligocene boundary." Climate of the Past Discussions 11, no. 5 (October 26, 2015): 4985–5019. http://dx.doi.org/10.5194/cpd-11-4985-2015.

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Abstract. A unique stratigraphic sequence of fossil leaves of Eotrigonobalanus furcinervis (extinct trees of the beech family, Fagaceae) from central Germany has been used to derive an atmospheric pCO2 record with multiple data points spanning the late middle to late Eocene, two sampling levels which may be earliest Oligocene, and two samples from later in the Oligocene. Using the inverse relationship between the density of stomata and pCO2, we show that pCO2 decreased continuously from the late middle to late Eocene, reaching a relatively stable low value before the end of the Eocene. Based o

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30

Lichtig, Asher J., Steven E. Jasinski, and Spencer G. Lucas. "Eocene North American Testudinidae and Geoemydidae (Reptilia, Testudines): A Re-Evaluation of Their Alpha Taxonomy, Ecology, and Origin." Proceedings 24, no. 1 (June 4, 2019): 24. http://dx.doi.org/10.3390/iecg2019-06195.

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We describe new material, including juvenile specimens, of Hadrianus corsoni, Hadrianus majusculus, Echmatemys haydeni, and Echmatemys naomi. Testudinidae evolved in North America from one of the geoemydid-like forms in the genus Echmatemys, which have their lowest stratigraphic occurrence in the earliest Wasatchian North American land mammal “age” (early Eocene, Ypresian).

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31

Yanin, B. T., and V. N. Benyamovsky. "BURROWS OF DECAPOD CRUSTACEANS IN PALEOGENE OF MIDDLE VOLGA AND ITS PALEOGEOGRAPHIC SIGNIFICANCE." Moscow University Bulletin. Series 4. Geology, no. 1 (February 28, 2018): 36–43. http://dx.doi.org/10.33623/0579-9406-2018-1-36-43.

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The description of the new finding of the burrows of decapod crustacean from Upper Paleocene and Lower Eocene deposits relating to two ichnotaxons (Thalassinoides suevicus Rieth and Ophiomorpha nodosa Lundgren), clarifies their stratigraphic position and state the paleogeographic significance for determining eustatic phases in the development of semirestricted Early Paleogene Volga-Caspian basin.

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32

Rasmussen, Dirk M., Brady Z. Foreman, Henry C. Fricke, Kathryn Snell, Lindsey Gipson, and Bernard Housen. "The early Paleogene stratigraphic evolution of the Huerfano Basin, Colorado." Rocky Mountain Geology 55, no. 1 (July 1, 2020): 1–26. http://dx.doi.org/10.24872/rmgjournal.55.1.1.

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ABSTRACT Sedimentary basins throughout the North American Western Interior contain a record of Late Cretaceous through Eocene deposition related to the Laramide orogeny. The typical stratigraphic progression includes an uppermost Cretaceous fluvio-deltaic geologic formation that is unconformably overlain by an alluvial or paludal Paleocene geologic formation. The Paleocene unit is usually characterized by drab overbank facies, and overlain by an interval of amalgamated fluvial sand bodies. The overlying Eocene geologic units are characterized by red bed overbank facies. These major stratigraph

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33

Pomerol, Charles. "Limites evenementielles ou limites conventionnelles en stratigraphie?" Bulletin de la Société Géologique de France IV, no. 2 (March 1, 1988): 357–60. http://dx.doi.org/10.2113/gssgfbull.iv.2.357.

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Abstract Most events characterising stratigraphic boundaries span an interval of time. The boundaries are often diachronous and they may be affected by environmental conditions. Therefore, the only accurate way to define a boundary is to select a boundary stratotype which records as many paleontological, geophysical and geochemical events as possible. Conventional stratigraphic boundaries are commonly difficult to identify precisely outside the stratotype area. This is why it is necessary to use first and last appearances of diagnostic features which occur below and above the conventional boun

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Hnylko, Svitlana. "Biostratigraphy of Paleocene-Eocene deposits of the Ukrainian Carpathians based on planktonic foraminifera." Geology and Geochemistry of Combustible Minerals 3-4, no. 185-186 (2021): 56–64. http://dx.doi.org/10.15407/ggcm2021.03-04.056.

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Paleogene deposits are the main reservoir of hydrocarbon resources in the Carpathians and creation of the modern stratigraphic scheme of these deposits is the basis for improving the efficiency of geological search works. The reliable stratification is a necessary precondition for the preparation of geological maps. Stratification of the Paleocene–Eocene sediments is provided by foraminifera, nannoplankton, dinocysts, radiolarians, sponge spicules, palynoflora. Planktonic foraminifera is the main stratigraphic group of the Paleogene fauna. In the predominantly non-calcareous flysch of the Pale

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Grainger, Nancy C., Michael E. Villeneuve, Larry M. Heaman, and Robert G. Anderson. "New UPb and Ar/Ar isotopic age constraints on the timing of Eocene magmatism, Fort Fraser and Nechako River map areas, central British Columbia." Canadian Journal of Earth Sciences 38, no. 4 (April 1, 2001): 679–96. http://dx.doi.org/10.1139/e00-093.

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Twenty-three new, precise, Eocene UPb and 40Ar/39Ar age determinations for calc-alkaline volcanic rocks of the Ootsa Lake Group and associated intrusive rocks, widespread in the Nechako Plateau in central British Columbia, constrain the timing of the Eocene magmatism to 53.247.6 Ma, with a local duration of as little as 23 million years. The new dates show that magmatism in the study area is partly coeval with that responsible for the Babine Igneous Suite Newman Volcanic Suite (5350 Ma) to the north, and for the Endako Group (5145 Ma), which overlies the Ootsa Lake Group; however, local

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Iakovleva, A. I., E. A. Shcherbinina, N. G. Muzylev, and G. N. Aleksandrova. "Dinocysts from the mid–upper Eocene Aktumsuk section, Ustyurt, Uzbekistan: biostratigraphy and paleoenvironments." Стратиграфия 27, no. 6 (December 12, 2019): 78–102. http://dx.doi.org/10.31857/s0869-592x27678-102.

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The results of palynological study of the MidUpper Eocene sediments of the Aktumsuk key-section (Ustyurt Plateau, Uzbekistan), calibrated with nannoplankton data, are presented. Dinocyst stratigraphical distribution permitted to recognize five Dinoflagellate zones from the Peri-Tethys zonation: Costacysta bucina, Enneadocysta pectiniformis, Rhombodinium draco, Rhombodinium perforatum, and Thalassiphora reticulata. First-order calibration with nannoplankton zones permitted to precise the lowermost occurrences of the key dinocyst species. Based on the dinocyst and nannoplankton data, two importa

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Martín-Martín, Manuel, Francesco Guerrera, Alí Maaté, Rachid Hlila, Francisco Serrano, Juan C. Cañaveras, Douglas Paton, et al. "The Cenozoic evolution of the Intrarif (Rif, Morocco)." Geosphere 18, no. 2 (February 8, 2022): 850–84. http://dx.doi.org/10.1130/ges02199.1.

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Abstract This paper provides an understanding of the sedimentary-tectonic evolution of the Cenozoic strata of the El Habt and Ouezzane Tectonic Units (Intrarif, External Rif) in Morocco. New data provide information about the depositional architecture and enable a correlation of the evolution of the External Rif in Morocco with that of the Betic Cordillera in Spain and the Tunisian Tell, which provides new insights for hydrocarbon exploration in the region regarding possible source, reservoir, and seal rocks. The reconstructed Cenozoic succession was bio-chronologically defined, and the major

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White, M. R. "A new species of <i>Somalina (Somalina hottingeri)</i> with partially vacuolate lateral walls from the Middle Eocene of Oman." Journal of Micropalaeontology 16, no. 2 (October 1, 1997): 131–35. http://dx.doi.org/10.1144/jm.16.2.131.

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Abstract. Somalina hottingeri, a new species with partially vacuolate lateral walls is described from the Middle Eocene of Oman. It is distinguished from the only previously recorded species with this wall structure (S. transitorius (Hottinger)) by having equatorial chambers that are relatively low throughout the test. On the basis of this character, it is suggested that S. hottingeri evolved from the Opertorbitolites douvillei Group (redefined here) and that it gave rise to the true somalines. S. transitorius is regarded as arising from O. latimarginalis (ex. O. latimarginalis Group, introduc

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Kopaevich, L. F., E. M. Bugrova, M. R. Latypova, A. V. Gusev, A. G. Kalmykov, and G. A. Kalmykov. "Foraminifera from the clay pulp of the Shugo mud volcano (Taman Peninsula)." Moscow University Bulletin. Series 4. Geology, no. 3 (December 15, 2022): 3–16. http://dx.doi.org/10.33623/0579-9406-2022-3-3-16.

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The foraminiferal assemblages from the mud volcanic breccia of the Shugo mud volcano (Kerch-Taman volcanic region, Taman peninsula) was studied in order to clarify the stratigraphic section of this region. Mud volcanic breccia contain shells of Miocene foraminifera, numerous well preserved Middle Eocene (Lutetian), and Upper Cretaceous (Santonian, Campanian, and Maastrichtian) species. The poorer preservation of the Cretaceous shells may be associated with the composition of the accommodating rocks, probably represented by terrigenous and carbonate-terrigenous turbidites. Finding the remains o

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Lillegraven, Jason A. "Stratigraphic relationships along the monoclinal eastern base of Bald Ridge and northwestern edge of Wyoming’s Bighorn Basin, U.S.A." Rocky Mountain Geology 54, no. 2 (December 1, 2019): 47–95. http://dx.doi.org/10.24872/rmgjournal.54.2.47.

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ABSTRACT This geologic study is focused on a less than 5 square-mile (ca. 13 km2) tract of public land in northwestern Wyoming, 8 miles (12.9 km) south-southwest of the small town of Clark in Park County. The study area is south of Clarks Fork of Yellowstone River along the eastern base of the topographic feature called Bald Ridge, also known structurally as Dead Indian monocline. Since the Middle Eocene, the study area has been along the northwestern margin of the Bighorn Basin. Prior to that time, the study area existed near the west–east center of the basin. Bald Ridge became elevated late

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Dechesne, Marieke, Ellen D. Currano, Regan E. Dunn, Pennilyn Higgins, Joseph H. Hartman, Kevin R. Chamberlain, and Christopher S. Holm-Denoma. "A new stratigraphic framework and constraints for the position of the Paleocene–Eocene boundary in the rapidly subsiding Hanna Basin, Wyoming." Geosphere 16, no. 2 (January 16, 2020): 594–618. http://dx.doi.org/10.1130/ges02118.1.

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Abstract The Paleocene–Eocene strata of the rapidly subsiding Hanna Basin give insights in sedimentation patterns and regional paleogeography during the Laramide orogeny and across the climatic event at the Paleocene–Eocene Thermal Maximum (PETM). Abundant coalbeds and carbonaceous shales of the fluvial, paludal, and lacustrine strata of the Hanna Formation offer a different depositional setting than PETM sections described in the nearby Piceance and Bighorn Basins, and the uniquely high sediment accumulation rates give an expanded and near-complete record across this interval. Stratigraphic s

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Boukhary, Mohamed, Radwan Abul-Nasr, Safia Al Menoufy, Omar Cherif, and Stefan Hontzsch. "Early Eocene Nummulitids from Wadi Dakhl, Egypt: Biometry and stratigraphic implications." Micropaleontology 59, no. 2-3 (2013): 145–66. http://dx.doi.org/10.47894/mpal.59.2.07.

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Doncieuxina Boukhary, Al Menoufy and Höntzsch n. gen (type species: Nummulites spirectypa Doncieux 1926), Nummulites partschi De La Harpe 1880, Nummulites roselli Schaub 1981, Nummulitesminervensis Schaub 1981, Aegyptoclypeus dakhlensis Boukhary, Abul-Nasr and Al Menoufy n. gen., n. sp., Discocyclina nudimargo Schwager 1883 and Assilina aff. A. prisca Schaub 1981, collected from two nummulitic banks within the Thebes Formation inWadi Dakhl, Southern Galala, Eastern Desert, Egypt, have been described and photographed. Their age is estimated as Early Eocene (Ypresian) as the assemblage has been

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Khan, Natasha, Khaista Rehman, Sajjad Ahmad, Jamil Khokher, M. Iqbal Hajana, and M. Hanif. "Sequence stratigraphic analysis of Eocene Rock Strata, Offshore Indus, southwest Pakistan." Marine Geophysical Research 37, no. 3 (August 25, 2016): 207–28. http://dx.doi.org/10.1007/s11001-016-9280-5.

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Kessler, Franz L., John Jong, and Mazlan Madon. "Eocene Sediments in the South China Sea, precursor deposits of the Oligocene expansion?" Berita Sedimentologi 47, no. 2 (October 2, 2021): 1–24. http://dx.doi.org/10.51835/bsed.2021.47.2.319.

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The stratigraphic record of Eocene in the Malaysian waters of the South China Sea is scarce; the few deep petroleum exploration wells and outcrops are located on the fringes of the SCS. Yet, despite the paucity of data we observe a variety of sediments that cover the range from fluviatile to (at least) neritic marine deposits. Whilst fluvial deposits dominate the Western Rim (Penyu, Malay basins), the Southern Rim (Sarawak) is characterized by deposits of a narrow and rapidly deepening shelf, with fluviatile, shallow marine clastics and carbonates passing seawards to outer shelf and neritic de

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Adrian, Brent, Patricia A. Holroyd, J. Howard Hutchison, and KE Beth Townsend. "Additional records and stratigraphic distribution of the middle Eocene carettochelyid turtle Anosteira pulchra from the Uinta Formation of Utah, North America." PeerJ 8 (August 24, 2020): e9775. http://dx.doi.org/10.7717/peerj.9775.

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Background Anosteira pulchra is one of two species of the obligately-aquatic freshwater clade Carettochelyidae (pig-nosed turtles) from the Eocene of North America. Anosteira pulchra is typically rare in collections, and their distribution is poorly documented. The Uinta Formation [Fm.] contains a diverse assemblage of turtles from the Uintan North American Land Mammal Age. Whereas turtles are abundantly preserved in the Uinta Fm., A. pulchra has been reported only from a few specimens in the Uinta C Member. Methods We describe new records of Anosteira pulchra from the Uinta Basin and analyze

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Avendaño, Gladys Marcela, Luis Felipe Cruz, Luis Enrique Cruz, and Mario Garcia. "Thermal evolution of Los Cuervos formation in the southern area of the Cesar sub-basin (Colombia), based on geochemical and petrophysical data." Earth Sciences Research Journal 25, no. 2 (July 19, 2021): 179–92. http://dx.doi.org/10.15446/esrj.v25n2.86025.

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The tectonic complexity to which the post-Cretaceous Cesar-Ranchería basin has been subjected has generated alterations in the evolution of its oil system, evidence of this is the lack of stratigraphic record in the Cesar sub-basin belonging to ages ranging from the Eocene to the Early Miocene. These units that are no longer present could have been deposited and eroded during this period of time, leaving their mark on the closest overlying units. Previously mentioned hypothesis oriented this research to study how the basin filling was in the time range from the Eocene to the early Miocene base

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Azevedo Schmidt, Lauren E., Regan E. Dunn, Jason Mercer, Marieke Dechesne, and Ellen D. Currano. "Plant and insect herbivore community variation across the Paleocene–Eocene boundary in the Hanna Basin, southeastern Wyoming." PeerJ 7 (October 15, 2019): e7798. http://dx.doi.org/10.7717/peerj.7798.

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Ecosystem function and stability are highly affected by internal and external stressors. Utilizing paleobotanical data gives insight into the evolutionary processes an ecosystem undergoes across long periods of time, allowing for a more complete understanding of how plant and insect herbivore communities are affected by ecosystem imbalance. To study how plant and insect herbivore communities change during times of disturbance, we quantified community turnover across the Paleocene–Eocene boundary in the Hanna Basin, southeastern Wyoming. This particular location is unlike other nearby Laramide

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Vicián, Zoltán, Helmut Krock, and Zoltán Kovács. "New gastropod records from the Cenozoic of Hungary." Földtani Közlöny 147, no. 3 (September 25, 2017): 265. http://dx.doi.org/10.23928/foldt.kozl.2017.147.3.265.

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26 newly collected Cenozoic marine gastropod species from Hungary are briefly described. Two Lutetian (Eocene), two Egerian (Oligocene) and 22 Badenian (Miocene) species are represented; most of them are new records, others are illustrated for the first time from the country. Extended stratigraphic and palaeogeographic ranges of species are summarized. A new taxon is introduced: Lautoconus harzhauseri Kovács nov. sp.

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Alege, T. S. "Sequence Stratigraphic Evaluation of Sediments Domicile in Day Field Located in the Onshore Central Swamp Depobelt of the Niger Delta, Nigeria." Journal of Applied Sciences and Environmental Management 26, no. 6 (June 30, 2022): 1129–35. http://dx.doi.org/10.4314/jasem.v26i6.20.

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This study employs the tool of sequence stratigraphy to evaluate Day Field, in the Onshore Niger Delta of Nigeria for hydrocarbon predictions using six (6) well logs displayed at standard scales to enhance log trends for lithologic and stratal package delineation. The identified key stratigraphic bounding surfaces were tied to well-defined palynological (P) zone and foraminiferal (F) zones with the aid of the biostratigraphic data and calibrated using the Niger Delta Chronostratigraphic chart. Five (5) MFSs (34.0, 33.0, 31.3, 28.1, and 26.2 Ma) and six (6) SBs (35.4, 33.3, 32.4, 29.3, 27.3, an

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Albright, L. Barry. "A protocetid cetacean from the Eocene of South Carolina." Journal of Paleontology 70, no. 3 (May 1996): 519–23. http://dx.doi.org/10.1017/s0022336000038440.

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Kellogg (1936, p. 242) described “an imperfectly preserved dorsal vertebra” from Texas, which he assigned to the primitive cetacean genus Protocetus. McLeod and Barnes (1990), however, were the first to report unequivocal protocetid remains from the Atlantic Coastal Plain. Since then, Hulbert and Petkewich (1991) and Hulbert (1993) have noted a well-preserved skeleton of a protocetid cetacean from middle Eocene deposits in Georgia. The purpose of this note is to report the recent discovery of additional protocetid remains from the coastal plain of South Carolina and to discuss their stratigrap

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