CAJ | 학술논문

The previously alleged “Ulunguhe Formation” in the Burqin region of Northern Xinjiang is lithologically different from the Ulunguhe Formation in its type-region, the Ulungur River area. The two regions are separated by a mountain of Paleozoic rocks. Therefore the sediments in two areas belong to different geological body respectively. The name “Ulunguhe Formation” should not be applied to the deposits in the Burqin region, for which, however, it is premature to name a new rock unit.A perissodactyl assemblage was collected from the sediments of Burqin. It consists of exclusively perissodactyls, including Cadurcodon cf. C. ardynensis, Gigantamynodon giganteus, Amynodontidae gen. et sp. indet., Indricotheriinae gen. et sp. indet., Rhinocerotidae gen. et sp. indet., and Brontotheriidae gen. et sp. indet., and is comparable with the late Eocene mammal faunas of Asia, such as Caijiachong fauna of Yunnan, Ulangochu fauna and Urtyn Obo fauna from Nei Mongol of China, Gua-teg and Khoer-Dzan fauna from Mongolia, and the Kusto fauna from Kazakhstan.The discovery of the late Eocene mammals in North Xinjiang indicates that the terrestrial biogeographic division into south and north provinces in the Asian continent had not been achieved by the late Eocene.