Ulusubasite Fm

Eastern Junggar. The type section is located at Mt. Kokesairgai of Zhifang, Xinjiang. It was named by No 2 Branch Team of Xinjiang Regional Geological Survey in 1977, and Hou Hongfei et al. formally quoted it in 1979.

Sandstone, limestone. It is composed of greenish-gray feldspathic sandstone, thin- to medium-bedded tuff, tuffaceous sandstone and pebble-bearing psammitic bioclastic limestone that can transition to a calcareous conglomerate with limestone nodules along strike. To the northeast of the 1759 high peak of Mt. Kokesairgai, the facies changes to sandy conglomerate intercalated with limestone nodules and bands, and is 117 m thick.

The lower part yields plant fossil Lepidodendropsis, and the top contains corals Endophyllum sp., Keriophyllum sp., Protomichelinia sp., etc.

Northeast of the 1759 high peak of Mt. Kaokesaergai the formation yields plant fossil Barrandeina sp.; coral Crassialveolites sp., Pachyfavosites sp., Endophyllum zhifangense, Tyrganolites sp.; and brachiopods Leptostrophia sp., “Fimbrispirifer” sp., etc.