Radiolarians, Foraminifers, and Biostratigraphy of the Coniacian–Campanian Deposits of the AlanKyr Section,Crimean Mountainsстатья

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Дата последнего поиска статьи во внешних источниках: 28 июня 2016 г.

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[1] Radiolarians, foraminifers, and biostratigraphy of the coniacian–campanian deposits of the alankyr section,crimean mountains / L. G. Bragina, V. N. Beniamovsky, , L. F. Kopaevich // Stratigraphy and Geological Correlation. — 2016. — Vol. 24, no. 1. — P. 39–57. Data on the distribution of radiolarians and planktonic and benthic foraminifers are obtained for the first time from the AlanKyr Section (Coniacian–Campanian), in the central regions of the Crimean Mountains. Radiolarian biostrata, previously established from AkKaya Mountain (central regions of the Crimean Mountains) were traced: Alievium praegallowayi–Crucella plana (upper Coniacian–lower Santonian,Alievium gallowayi–Crucella espartoensis (upper Santonian without the topmost part), and Dictyocephalus (Dictyocryphalus) (?) legumen–Spongosaturninus parvulus (upper part of the upper Santonian). Radiolarians from the Santonian–Campanian boundary beds of the Crimean Mountains are studied for the first time, and Prunobrachium sp. ex gr. crassum–Diacanthocapsa acanthica Beds (uppermost Santonian–lower Campanian)are recognized. Bolivinoides strigillatus Beds (upper Santonian) and Stensioeina pommerana–Anomalinoides (?) insignis Beds (upper part of the upper Santonian–lower part of the lower Campanian) are recognized. Eou vigerina aspera denticulocarinata Beds (middle and upper parts of the lower Campanian) and Angulogavelinella gracilis Beds (upper part of the upper Campanian are recognized on the basis of benthic foraminifers. These beds correspond to the synchronous biostrata of the East European Platform and Mangyshlak. Marginotruncana coronata, Concavatotruncana concavata Beds (Coniacian–upper Santonian), Globotruncanita elevata Beds(terminal Santonian), and Globotruncana arca Beds (lower Campanian) are recognized on the basis of plank tonic foraminifers. Radiolarian and planktonic and benthic foraminiferal data agree with one another. The position of the Santonian–Campanian boundary in the AlanKyr Section, which is located stratigraphically above the levels of the latest occurrence of Concavatotruncana concavata and representatives of the genus Marginotruncana, is refined, i.e., at the level of the first appearance of Globotruncana arca. A gap in the Middle Campanian– lower part of the upper Campanian is established on the basis of planktonic and benthic foraminifers. The Santonian–Campanian beds of the AlanKyr Section, on the basis of planktonic foraminifers and radiolarians, positively correlate with synchronous beds of the CrimeanCaucasian region, and beyond. Benthic foraminifers suggest a connection with the basins of the East European Platform. Keywords: Santonian, Campanian, planktonic foraminifers, benthic foraminifers, radiolarians, biostratigraphy, Crimea DOI. [ DOI ]

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