OSTRACOD FAUNA FROM THE YAXICUO FORMATION IN THE HOH XIL BASIN, QINGHAI PROVINCE AND ITS STRATIGRAPHIC SIGNIFICANCE
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Abstract:
The Hoh Xil Basin is the largest continental Cenozoic basin in the plateau’s interior. However, the stratigraphic age of the Cenozoic sediments of the Hoh Xil Basin remain debated. The Yaxicuo Formation from the Yanshiping area, southern Hoh Xil Basin contains abundant ostracod fossils. The research on this ostracod fauna is important for the study of Cenozoic biostratigraphic correlation for the hinterland of the Tibetan Plateau. In this study, 48 ostracod species belonging to 14 genera are described from the Yaxicuo Formation of the Tongtianhe section. The ostracod fauna can be subdivided into two assemblage zones: Austrocypris cf. posticaudata-Candoniella albicans-Leucocythere tropis assemblage and Ilyocypris errabundis-Darwinula stenimpudica assemblage. Through comparing these ostracod fossils with other ostracod records in the Qaidam Baisn, Luopola Basin, Jianghan Basin and Bohai area etc., we bracket the depositional age of the Yaxicuo Formation of the studied Tongtianhe section as the late Eocene?early Oligocene.
