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Late Ordovician brachiopods from the Selety river basin, north Central Kazakhstan

2003; Institute of Paleobiology; Volume: 48; Issue: 1 Linguagem: Inglês

1732-2421

Igor F. Nikitin, Leonid E. Popov, Michael G. Bassett,

Geochemistry and Elemental Analysis

A medium−diversity fauna of late Ordovician rhynchonelliformean brachiopods occurs in the Tauken Formation (upper Caradoc–lowermost Ashgill) of north Central Kazakhstan. It demonstrates close similarity to the approximately contem− poraneous faunas characteristic of shallow clastic shelves (BA 2–3) of the Chingiz and Chu−Ili ranges (both in Kazakhstan) and South China, but is characterized by a high proportion of endemic new species, including Tetra− phalerella bestiubensis sp. nov., Glyptomena kaskolica sp. nov., Dinorthis taukensis sp. nov., Rhynchotrema seletensis sp. nov., and Nalivkinia (Pronalivkinia) zvontsovi sp. nov. The abundance of Rhynchotrema is somewhat unusual by com− parison with faunas from other Kazakhstanian terranes, where rhynchonellides of the family Ancistrorhynchidae are usu− ally dominant in near−shore biofacies. The occurrence of the atrypides Sulcatospira and early Nalivkinia demonstrates a clear biogeographical linkage with approximately contemporaneous faunas of South China.