Eocene Ostracoda Fauna Of Duina, Yadong, Southen Tibet

Qinghai-Tibet Plateau, located in the south Asian continent, is a leading global east-west Tethys giant—one of the main Himalayan tectonic domain. It is a unique and complex crustal structure to attract the concern of workers around the world to learn and explore. Uplift of the Himalayas and the Tibetan Plateau is mainly due to the Indian plate and Eurasian plate collision. The role of collision after collision of a uniform in the process of change. Collisions can be observed without leaving any obvious geological record. Therefore, we must have used before and after the collision occurred in the geologic record time to limit the scope of the collision event. From the stratigraphic point of view, the performance of collision is the highest water and marine strata to withdraw from the end, with the highest marine layer to infer continental collision occurred.Biostratigraphy is based on the biological law of development and to spatial and temporal distribution of fossil classification and correlation of strata, for stratigraphic division, environmental evolution, resources and other aspects of the exploration studies play an important role in the foundation. Sequence in the sedimentary strata, the ancient biological method is the most important stratigraphic division and correlation of one of the methods. Biostratigraphy stratigraphic position is contained in the use of fossil data on the biostratigraphy, and it is also to determine the relative age of strata and regions important means of comparison.Indian plate and Eurasian plate collision process, because the edge of two plates can not be completely put together, so after the collision of continental crust formation in the residual basin. Residual basin increased with the conduct of the collision, the sea disappeared, marine deposit also will be stopped. The region in the top marine sedimentary strata that is the highest level, and its geological agebasin represents the demise of the time remaining. So the highest level of marine collision and development is to restore the key.Development of the Tibetan region in southern Tibet, the most advanced marine deposits, the Zhepure Formation is the youngest marine sediments in Yadong, southern Xizang (Tibet). The method using biostratigraphy that study for the highest level of marine biota, which is for the final demise of the Tibetan Tethys provide time constraints. Sixty eight samples containing ostrocods were collected for this study from the upper sand-shale member of the Zhepure Formatiom in Ria section, Duina, Yadong county of southern Tibet. 35 species of 23 genus were indentified and three Ostracod assemblages are recognized (in ascending order):①Cythereridea appendieulea– Cytherella obtusa assemblage,②Phlyctenophora zongpuensis– Aglaiocypris xizangensis assemblage,③Loxoconcha sp.– Xestoleberis kangpaensis assemblage. The assemblage is dated as late Lutetian to early Priabonian of Eocene. It indicates that the sea water did not withdraw from the southern Tibet until early Priabonian. Three species have been described and illustrated in this paper.