New data on conodonts from the Kasimovian Stage of the Usolka section, southern Ural Mountains

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• 作者：G. M. Sungatullina ; V. I. Davydov
• 关键词：Conodonts ; Idiognathodus ; Streptognathodus subexelsus ; Kasimovian Stage ; Usolka section
• 刊名：Paleontological Journal
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：49
• 期：10
• 页码：1142-1149
• 全文大小：1,579 KB
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• 作者单位：G. M. Sungatullina (1)
  V. I. Davydov (1) (2)
  
  1. Kazan Federal University, Kremlevskaya ul. 18, Kazan, 420008, Russia
  2. Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID, 83725, USA
  
• 刊物主题：Paleontology;
• 出版者：Springer US
• ISSN：1555-6174

文摘

Conodonts from the Moscovian–Kasimovian boundary beds of the Usolka section (southern Ural Mountains) are studied. Morphological features of conodont elements are analyzed and the main taxonomically significant characters of conodonts from the Moscovian–Kasimovian boundary are revealed. These characters are intended for the establishment of reliable determination of index species of the lower boundary of the Kasimovian Stage of the International Stratigraphic Chart. The most promising species marking this border is apparently “Streptognathodus” subexcelsus Alekseev et Goreva.