Wujiashan Fm
Type Locality and Naming
The type section is located at Wujiashan, 6 km northwest of Wangmo Town in Chengxian County, Gansu. It was named by Gansu Metallurgical and Geological Exploration Company in 1980, and Zhou Weijun formally quoted it in 1983.
Lithology and Thickness
Schist. It is composed of biotite quartz schist, two-mica quartz schist intercalated with banded biotite quartz marble, pebble-bearing two-mica quartz schist, thin- to medium-bedded fine-grained quartz sandstone and quartz feldspathic sandstone intercalated with some beds of pebble-bearing quartz sandstone. Lower part has intercalations of thick-bedded conglomerate, but the base does not outcrop; and the total thickness is more than 1480 m.
Sandstones possess graded bedding, horizontal bedding and oblique bedding, and the bases of conglomerates possess erosion surfaces; so these possibly originated from density- or turbidity-current deposits.
Relationships and Distribution
Lower contact
The base does not outcrop.
Upper contact
Conformably overlain by the Qingshuigou Fm.
Regional extent
The distribution of the Wujiashan Fm is limited only to the core of Wujiashan anticline, east of Xihanshui.
GeoJSON
Fossils
The formation is deeply metamorphosed without any fossil remains.
Age
Depositional setting
Additional Information