期刊
ACTA PALAEONTOLOGICA POLONICA
卷 57, 期 4, 页码 729-735出版社
INST PALEOBIOLOGII PAN
DOI: 10.4202/app.2011.0110
关键词
Ammonoidea; extinction; palaeobiogeography; Maastrichtian; Danian; Cretaceous-Paleogene boundary; Turkmenistan; Kopet Dagh
类别
Machalski, M., Jagt, J.W.M., Alekseev, A.S., and Jagt-Yazykova, E.A. 2012. Terminal Maastrichtian ammonites from Turkmenistan, Central Asia. Acta Palaeontologica Polonica 57 (4): 729-735. A complete uppermost Maastrichtian-Danian succession in the Sumbar River section, western Kopet Dagh (southwest Turkmenistan, Central Asia), constitutes one of the few instances in the world where the fossil record of the last ammonites can be directly positioned with respect to the iridium-rich, impact-related clay layer, which defines the Cretaceous Paleogene (K-Pg) boundary. Two ammonite taxa, Baculites cf. vertebralis and Hoploscaphites constrictus johnjagti, range up to a level directly beneath the K-Pg boundary clay in the Sumbar River section. Thus, these two forms probably survived until the very end of the Maastrichtian in the western Kopet Dagh area. The terminal Maastrichtian ammonite records from the Sumbar River area represent the southeasternmost occurrences of these essentially Boreal taxa.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据