CAMBRIAN RHYNCHONELLIFORMEA BRACHIOPODS OF THE SIBERIAN PLATFORM (SYSTEMATIC COMPOSITION, FACIES OCCURRENCE AND PALEOGEOGRAPHIC DISTRIBUTION)
D.A. Ilyin1, I.V. Korovnikov 1,2
1Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
2 Novosibirsk State University, Novosibirsk, Russia
Keywords: Rhynchonelliformea brachiopods, Siberian platform, Cambrian, facies occurrece, paleogeographic distribution.
Abstract
The article analyzes the published data and collections of brachiopods available to the authors for the systematic composition of brachiopods of the Rhynchonelliformea from the Cambrian of the Siberian platform. Currently, 50 species have been described and one taxon has been assigned to the genus (Finkelnburgia sp.). All of them belong to 15 genera, 10 families (two genera have not been identified as belonging to families), and five classes. Cambrian brachiopods of the Rhynchonelliformea of the Siberian Platform are divided into six associations, which are characterized by a certain taxonomic composition, paleogeographic and stratigraphic distribution. The most representative are brachiopods of the Obolellata. Their findings were noted in North America and Greenland and allow us to compare the deposits of the Lower Cambrian of North America and the Siberian platform quite confidently. The Strophomenata is also widely used. But of the ten Siberian species of the Billingsella genus, eight are endemic. Therefore, the findings of these brachiopods can be effectively used for correlation at the generic level to compare the transitional layers between the Middle and Upper Cambrian. Representatives of other classes (Chileata, Kutorginata, and Rhynchonellata) have less potential for inter-regional correlations. Although some of their representatives are found in other regions of the world and can be used as an additional tool for comparing remote sections.
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