Upper Albian-Turonian Foraminifers and Radiolarians from the Kelevudag section, Northeastern Azerbaijanстатья

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Дата последнего поиска статьи во внешних источниках: 17 декабря 2015 г.

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1. Полный текст статья в журнале SGC580_Kelevudag_2015.pdf 15,2 МБ 16 ноября 2015 [lfkopaevich]
2. Полный текст статья в журнале SGC580_Kelevudag_2015_1.pdf 15,2 МБ 16 ноября 2015 [lfkopaevich]

[1] Kopaevich L. F., Beniamowskii V. N., Bragina L. G. Upper albian-turonian foraminifers and radiolarians from the kelevudag section, northeastern azerbaijan // Stratigraphy and Geological Correlation. — 2015. — Vol. 23, no. 6. — P. 580–599. New data on planktonic and benthic foraminifers and radiolarians derived from the upper Albian– Turonian sediments of the Kelevudag section, northeastern Azerbaijan, are reported. Two planktonic foramin iferal biostratigraphic units are recognized, namely, the Thalmanninella deeckei Beds (uppermost lower–lower most middle Cenomanian, top of the lower part of the Kemishdag Formation) and Dicarinella hagni Beds (lower Turonian, top of the upper part of the Kemishdag Formation). Two units, the Pseudovalvulineria cen omanica–Berthelina berthelini Beds (middle–upper Cenomanian, top of the lower part of the Kemishdag For mation) and Lingulogavelinella globosa Beds (upper Cenomanian–lower Turonian, top of the upper part of the Kemishdag Formation), are distinguished by benthic foraminifers. On the basis of the radiolarian studies, the following units are defined: the Dorypyle ? anisa–Pseudodictyomitra languida Beds (upper Albian, upper part of the Kyulyuli Formation), Patellula spica–Crolanium triangulare Beds (lower Cenomanian, base of the lower part of the Kemishdag Formation), Pseudoaulophacus lenticulatus–Thanarla gracilis Beds (middle Cenoma nian, top of the lower part of the Kemishdag Formation), and the Orbiculiforma quadrata–Pseudodictyomitra pseudomacrocephala Beds (uppermost upper Turonian, lower part of the Kemchi Formation). The age esti mates available from foraminifers and radiolarians do not contradict each other. The time of accumulation of the Kemishdag Formation was previously considered within only the Cenomanian. According to the new avail able foraminiferal data, the range of the Kemishdag Formation is widened and it is believed to correspond to the Cenomanian–lower Turonian. On the basis of foraminiferal and radiolarian studies, the stratigraphic position of the lower boundary of the Kemchi Formation is determined within the Turonian and the Turonian–Conia cian boundary is defined in the lower part of the Kemchi Formation. Keywords: Albian, Cenomanian, Turonian, planktonic foraminifers, benthic foraminifers, radiolarians, biostratigraphy, Azerbaijan. [ DOI ]

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