Linxi Fm
Type Locality and Naming
The type (representative) section is the Dongguandi-Qujiagou section in Linxi County, as recommended by the Regional Geological Survey Party of Hebei Province in 1959. It was named by Teihard de Chardin in 1924-1926.
Lithology and Thickness
Clastics. Lower part represents a member of grey-black silty slate and shale, with its upper layer yielding plant fossils (phytolites), with a thickness of 1494 m. Upper part represents a yellow-green and grey-green sandstone member, composed largely of fine-grained sandstone and siltstone, intercalated with clayey limestone lenses and slate, with the middle and lower layers yielding a big amount of bivalves and plant fossils (phytolites), with a thickness of 732 m. The clayey rocks are intercalated with phosphorus-bearing bands and nodules. Total thickness is over 2226 m
Relationships and Distribution
Lower contact
Unconformable contact with the underlying Xiwuzhumuqinqi Fm
Upper contact
Unknown contact relationship with the overlying Mesozoic strata. [This might be the regional Alatanheli Gr of middle Jurassic]
Regional extent
Distributed in the Linxi region to the north of the Xilamulun River in the Zhaomuda League.
GeoJSON
Fossils
Bivalves such as Palaeomutela khinganensis, P. soronensis, etc.; Plant fossils (phytolites) such as Calamites, Paracalamites, Noeggerathiopsis, etc.,
Age
Depositional setting
The beds with bivalves are interpreted as a lake-facies.
Additional Information