Diaosu Fm
Type Locality and Naming
The type section is located at Diaosu, Urt Moron Township, Golmud, Qinghai. It was named by the No. 1 Geological Party of Qinghai in 1975.
Lithology and Thickness
Limestone. Light-gray thick-bedded oolitic limestone, bioclastic limestone and organic limestone, with dolomitic bioclastic limestone, and thin-bedded fine-grained sandstone and pebbled quartzose sandstone at the bottom, 178.5 m thick. At places such as Haerzhagou on the north slope of the Kunlun Mts. southwest of Mangnai, Lawuzhagou and Yemaquan, its bottom is formed by conglomerate, sandstone and shale, and the upper part consists of limestone, thickness ~136 m.
Relationships and Distribution
Lower contact
Disconformable contact with the underlying Daganggou Fm. At places such as the north slope of the Kunlun Mts. southwest of Mangnai, Lawuzhagou and Yemaquan, it is in disconformable contact with the underlying Xihansitegou Fm
Upper contact
Conformable contact with the overlying Sijiaoyanggou Fm.
Regional extent
GeoJSON
Fossils
Lower part contains Fusulinids Pseudostafella antiqua posterior, etc. as well as corals Arachnastraea asiatica, etc. The Upper part contains fusulinids Fusulina absidata, etc..
At places such as the north slope of the Kunlun Mts. southwest of Mangnai, Lawuzhagou and Yemaquan, it yields fusulinids Profusulinella, Fusulinella, etc.
Age
Depositional setting
It is interpreted as a littoral-neritic facies
Additional Information