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An integrated inoceramid-foraminiferal biostratigraphy of the Turonian and Coniacian strata in south-western Crimea, Soviet Union
Abstract and Figures
The inoceramid and the foraminiferal zonation within the Turonian and Lower Coniacian sequence of south-western Crimea (Soviet Union), based on the material from the Aksu-Dere sections are analyzed. The traditional Inoceramus labiatus Zone is subdivided into the Mytiloides mytiloides Zone and the Mytiloides hercynicus Zone. Within the Inoceramus woodsi (=costellatus) Zone of the Upper Turonian commonly used in the Soviet Union, The I. costellatus, the Cremnoceramus? waltersdorfensis, and the C. rotundatus Zone are recognized, and the Turonian/Coniacian boundary is placed at the base of the latter. Taxonomy of the selected inoceramid species is shortly discussed. -Authors
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... Долгое время туронские отложения Юго-Западного Крыма разделялись на два подъяруса [Найдин, Алексеев, Копаевич, 1981; Алексеев, 1989]. Позже на основе микрофауны и иноцерамов обсуждалась возможность трехчленного деления турона в разрезе Аксу-Дере [Kopaevich, Walaszczyk, 1990;Копаевич, Валащик, 1993] [Алексеев, 1989]), а, следовательно, и подошва зоны Inoceramus lamarcki, расположена примерно в 50 м выше горизонта черных сланцев и в 15 м выше уровня находки аммонита (рис. 2). ...
... deformis erectus. This succession, and C. deformis erectus in particular, have been documented from Mangyshlak in western Kazakhstan (Marcinowski et al., 1996;Walaszczyk et al., 2013), the Caucasus and Crimea (Kopaevich and Walaszczyk, 1990), the Cretaceous of Saratov (Walaszczyk, unpublished) and Briansk , across central and western Europe (e.g., Walaszczyk and Wood, 1998;Wood et al., 2004;Walaszczyk et al., 2010;Walaszczyk, 1992Walaszczyk, , 2000; and references therein), the Gulf Coast Subprovince (Texas, Hancock and Walaszczyk, 2004;northeastern Mexico, Ifrim et al., 2014, 2019, and from the US Western Interior Cobban, 1998, 2000;Cooper et al., 2017). It has also been documented in the Tethyan Realm: for example in Romania (Pauliuc, 1968, Szasz, unpublished); Bulgaria (Dochev and Granchovski, 2017); Sardinia (Walaszczyk, 2000), and from the South Atlantic Subprovince (Brazil, Kauffman and Bengtson, 1985 and partly documented in Nigeria;Gebhardt, 2001Gebhardt, , 2010. ...
... deformis erectus. This succession, and C. deformis erectus in particular, have been documented from Mangyshlak in western Kazakhstan (Marcinowski et al., 1996;Walaszczyk et al., 2013), the Caucasus and Crimea (Kopaevich and Walaszczyk, 1990), the Cretaceous of Saratov (Walaszczyk, unpublished) and Briansk , across central and western Europe (e.g., Walaszczyk and Wood, 1998;Wood et al., 2004;Walaszczyk et al., 2010;Walaszczyk, 1992Walaszczyk, , 2000; and references therein), the Gulf Coast Subprovince (Texas, Hancock and Walaszczyk, 2004;northeastern Mexico, Ifrim et al., 2014, 2019, and from the US Western Interior Cobban, 1998, 2000;Cooper et al., 2017). It has also been documented in the Tethyan Realm: for example in Romania (Pauliuc, 1968, Szasz, unpublished); Bulgaria (Dochev and Granchovski, 2017); Sardinia (Walaszczyk, 2000), and from the South Atlantic Subprovince (Brazil, Kauffman and Bengtson, 1985 and partly documented in Nigeria;Gebhardt, 2001Gebhardt, , 2010. ...
Following votes in the Coniacian Working Group, the
Cretaceous Subcommission and the International Commission on Stratigraphy, on May 1st, 2021, the International
Union of Geological Sciences voted unanimously to ratify
the Global Stratotype Section and Point (GSSP) proposal
for the base of the Coniacian Stage of the Upper Cretaceous
Series and Cretaceous System. The lower boundary of the
Coniacian Stage is placed at the base of Bed 46 of the Salzgitter-Salder section in northern Germany. The boundary is
defined by the first appearance of the inoceramid bivalve
species Cremnoceramus deformis erectus (Meek) and complemented by the Navigation carbon isotope event. Additional
data include the bivalve genus Didymotis, foraminifera,
ammonite, nannofossil and organic-walled dinoflagellate
cyst events. Three auxiliary sections (Słupia Nadbrzeżna,
central Poland; Střeleč, Czech Republic; El Rosario, NE
Mexico) supplement the details of the boundary record in
various facies, and in differing geographic and biogeographic contexts.
In 394 samples characterizing 266 stratigraphic levels in four Turonian–Santonian sections in the Southwestern Crimea, characteristic remanent magnetization components (ChRM) formed at the stage of diagenesis is identified. The data obtained represent the record of the Paleocene geomagnetic variations of high amplitude (rms deviation S = 25.9° with a fixed cut-off angle of 45°, which is about twice as high as the model S for this latitude) in the sediments formed in ~5–6 Ma and are interpreted as anomalous behavior of the geomagnetic field in the Turonian, Coniacian, and Santonian.
New complex data have been obtained for two sections of the Santonian–Campanian boundary of Southwestern Crimea. Article 1 presents detailed geological descriptions of sections, lithological, mineralogical, and paleoichnological materials, and the results of determining macro- (crinoids, ammonoids, belemnites) and micropaleontological (dinocysts, nannoplankton, benthic and planktonic foraminifers) remains. On the basis of the results of research, sea level fluctuations, variations in the activity of allogenic input (including pyroclastic material), and other features of sedimentation have been reconstructed. All macroand micropaleontological data confirm the late Santonian–early Campanian age of the rocks; for each of the micropaleontological groups, biostratigraphic units have been established and a detailed division of the sections has been carried out.
Получены новые комплексные данные по двум разрезам пограничного интервала сантона–кампана Юго-Западного Крыма. В статье 1 представлены детальные геологические описания разрезов, литоло-го-минералогические и палеоихнологические материалы, результаты определений макро- (криноидеи, аммониты, белемниты) и микропалеонтологических (диноцисты, наннопланктон, бентосные и планктонные фораминиферы) остатков. По результатам исследований реконструированы колебания уровня моря, вариации активности аллотигенного привноса (в том числе пирокластического материала) и другие особенности осадконакопления. Все макро- и микропалеонтологические данные подтверждают позднесантонский–раннекампанский возраст пород, по каждой из микропалеонтологических групп установлены биостратоны и проведено детальное расчленение разрезов.
The publication contains a comprehensive lithological-stratigraphic description of the Bodrak River Basin Cretaceous-Paleogene (South-Western Crimea). It provides detailed descriptions of key sections, illustrated by columns, numerous photographs of outcrops and thin sections, images of paleontological remains. 100 million year’s regional geological history Early Cretaceous to Eocene is considered. This manual is applicative for use at the Crimean field practices of St. Petersburg State University scheduled for «Geology», «Petroleum Engineering», «Geography», «Ecology and Environmental Management», «Soil Science» curricula. The book may be interesting for lecturers, geology and geophysics students from other universities, Crimea geology specialists, local geographers and tourists. The presented materials will be useful for seismic data and well logging results interpretation in predicting hydrocarbon accumulations in the Cretaceous and Paleogene sediments from the Northern Crimea, Black and Azov Sea shelves.
Manifestations of short-term global and subglobal events have been recognized in the Mesozoic and Cenozoic sedimentary record of the North Caucasus: Paleocene/Eocene boundary PETM, late enomanian
(OAE2), late Albian (OAE1c and OAE1d), terminal Aptian–early Albian (OAE1b), early Aptian (OAE1a), late Hauterivian (Faraoni), late Valanginian (Weissert), early Toarcian, late Pliensbachian, and
others. The similarities and differences of their sedimentological, geochemical, and paleoecological characteristics were revealed during complex studies. Some events are characterized by both negative and positive carbon and oxygen isotopic anomalies. It was shown that most part of the paleoecological events occurred
during the sharp sea-level fluctuations and was frequently accompanied by the accumulation of sediments variably enriched in organic matter (OM). The events were characterized by different-scale turnovers in the microbiota composition. Changes in microfossil assemblages allowed us to estimate the degree of perturbation
of the trophic level of basins in response to the terrestrial influx of nutrients during marine transgression.
Manifestations of short-term global and subglobal events have been rercognized in the Mesozoic and Cenozoic sedimentary record of the North Caucasus: Paleocene/Eocene boundary PETM, late Ceno-manian (OAE2), late Albian (OAE1c and OAE1d), terminal Aptian-early Albian (OAE1b), early Aptian (OAE1a), late Hauterivian (Faraoni), late Valanginian (Weissert), early Toarcian, late Pliensbachian, and others. The similarities and differences of their sedimentological, geochemical, and paleoecological characteristics were revealed during complex studies. Some events are characterized by both negative and positive carbon and oxygen isotopic anomalies. It was shown that most part of the paleoecological events occurred during the sharp sea-level fluctuations and was frequently accompanied by the accumulation of sediments variably enriched in organic matter (OM). The events were characterized by different-scale turnovers in the microbiota composition. Changes in microfossil assemblages allowed us to estimate the degree of perturbation of the trophic level of basins in response to the terrestrial influx of nutrients during marine transgression.
The large quarries of the Cement Industry in the environs of Opole, Southern Poland, provide an opportunity for detailed studies and faunal collecting in the Turonian and Lower Coniacian interval of the Opole Cretaceous sequence. Basing on the rich paleontological material 10 well defined, inoceramid zones are recognized. Their correspondance to the zones established elsewhere and their correlation with the international ammonite standard division is presented. -Author
