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Stratigraphic and paleogeographic distribution of the Upper Ordovician bryozoans of Mongolia

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Abstract

The taxonomic diversity and distribution of the Upper Ordovician bryozoans of Mongolia are analyzed. Five heterochronous assemblages of bryozoans are established: Chigertei and Tsagaan del in the Sandbian Stage and Bairim Ovoo, Uuregnur, and Sairin in the Katian Stage. The bryozoans are shown to be important for solving complex problems of stratigraphy of the Ordovician of Mongolia and for paleogeographic reconstructions.

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Correspondence to Ya. Ariunchimeg.

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Ariunchimeg, Y. Stratigraphic and paleogeographic distribution of the Upper Ordovician bryozoans of Mongolia. Paleontol. J. 43, 1432–1438 (2009). https://doi.org/10.1134/S0031030109110082

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