Hongshantou Fm
Type Locality and Naming
Himalayas. The type section is in roadcuts along the highway from Jiacun to Yali by the road from Lhasa to Zham, Nyalam County, southern Tibet. The Hongshantou Fm was named by Wang Yigang (1974).
Synonym: (红山头组）
Lithology and Thickness
The formation is composed of brownish gray calcareous and silty shale intercalated with fine-grained sandstone. In the type area, the Hongshantou Fm is about 70 m thick.
Relationships and Distribution
Lower contact
This stratigraphic unit rests conformably on the argillaceous limestone and bioclastic limestone of the upper formation of the Jiacun Gr, the present Jiaqu Fm, which yields Sinoceras chinense.
Upper contact
Regionally, the next younger unit is the Shiqipo Fm of Early Silurian.
Regional extent
It is exposed only in the type area.
GeoJSON
Fossils
Only minor Nautiloids Michelinoceras is found from this formation.
Age
Depositional setting
Additional Information