Hongshuigoukou Fm
Type Locality and Naming
It was named by Fu Lipu et al. in 1983. The type section is located at Nanshimengou in Zhouqu County, Gansu Province.
Synonym: (红水沟口组) , Hongshuigou Fm
Lithology and Thickness
The formation, 88 m in thickness, consists of grayish black thin-bedded calcareous slate, dark gray and grayish white thick-bedded banded argillaceous limestone and reef limestone.
Relationships and Distribution
Lower contact
It rests conformably in between the underlying Maer Fm
Upper contact
It rests conformably in between the overlying Nanshimengou Fm
Regional extent
The lithology of the Hongshuigoukou Fm keeps rather steady except becoming coarser-grained and thicker, up to 679 m in thickness, in Diebu County in west.
GeoJSON
Fossils
It yields corals Mesofavosites zhuquensis, Favosites cf. subgothlandicus, Propora sp.; cephalopods Parakionoceras pectinatum, Geisonoceras cf. senile; brachiopods Protathyris ingens, P. gigantea, Atrypoidea quadrata, etc.; conodont Spathognathodus silurica, etc. and graptolite sPristiograptus ultimus, P. praedubius, etc.
Age
Depositional setting
Additional Information