Temat: Berriasian calcareous nannofossils - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Further observations on the bio- and magnetostratigraphy of the J/K boundary interval in southern Ukraine
Autorzy:: Wimbledon, William A.P.
Svobodova, Andrea
Bakhmutov, Vladimir
Poliachenko, Ievgen
Hlavatskyi, Dmytro
Powiązania:: https://bibliotekanauki.pl/articles/2127369.pdf
Data publikacji:: 2022
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: J/K boundary
Tithonian
Berriasian calcareous nannofossils
magnetostratigraphy
Opis:: This is an account of finds of stratigraphically useful calcareous nannofossils and the magnetostratigraphy of the Jurassic-Cretaceous boundary interval of the eastern Crimean peninsula (southern Ukraine). We compare these new complementary results with those presented by our team in earlier publications. A missing interval in the Crimean sequence is filled, and the position of the Tithonian-Berriasian (J/K) boundary is confirmed.
Źródło:: Geological Quarterly; 2022, 66, 1; art. no. 11
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Biostratigraphy and magnetostratigraphy of the uppermost Tithonian–Lower Berriasian in the Theodosia area of Crimea (southern Ukraine)
Autorzy:: Bakhmutov, V. G.
Halásová, E.
Ivanova, D. K.
Józsa, Š.
Reháková, D.
Wimbledon, W. A. P.
Powiązania:: https://bibliotekanauki.pl/articles/2059767.pdf
Data publikacji:: 2018
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Berriasian
magnetostratigraphy
calcareous nannofossils
calpionellids
foraminiferans
ammonite biostratigraphy
Opis:: We present evidence for the uppermost Jurassic-lowest Cretaceous interval in Crimea, coastal southern Ukraine. Three facies zones are distinguished in the upper Dvuyakornaya and the Mayak formations of the eastern Crimean Peninsula: basinal, slope and toe-of-slope zones. In this interval we identify the lowest Berriasian Jacobi and Grandis subzones of authors, in expanded form, exceeding 160 metres in thickness. We present new magnetostratigraphic interpretations, and identify two normal and two reversed polarity intervals, assigned to M19n, M18r, M18n and M17r, with M19n2n, M19n1r and M19n1n identified in the uppermost Dvuyakornaya Formation. In the Mayak Formation we record the top of M19n.1n, with M18r, M18n and a thick M17r above. In these two formations component calpionellid species have been identified which characterise the Alpina, Ferasini and Elliptica subzones (Calpionella Zone). In M19n, the FADs of the calcareous nannofossils Hexalithus strictus, Cruciellipsis cuvillieri, Nannoconus wintereri, N. steinmannii minor and N. kamptneri minor are found, which is consistent with other Tethyan regions. N. steinmannii steinmannii and N. kamptneri kamptneri first appear in M18r at Ili Burnu . Specimens of the apparently Tithonian foraminiferan index Anchispirocyclina lusitanica are found, but in the Berriasian lower Mayak Formation.
Źródło:: Geological Quarterly; 2018, 62, 2; 197--236
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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