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Analysis of biofacies and bionomic zonation in the Triassic reveals distinct zones, indicating ecological conditions in the Yana River basin.
The Triassic of the Sartang-Nel’gese interfluve in the Yana River basin (Eastern Yakutia) has first been found to contain biofacies and bionomic zonation is proposed. The biofacies schemes are given for various time intervals, mainly, zonal moments of the Middle and Late Triassic. Three biofacies zones are recognized: Western (the Sartang River), Transitional (the Borulakh River), and Eastern (the Nel’gese River). Based on the catenic analysis, bathymetric profiles of the paleobasin are reconstructed.
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M. I. Kurushin (1992) studied this question.
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