Xiaputonggou Fm
Type Locality and Naming
The type section is located at Putonggou, 3.2 km east of Zanwa, Ruerga County, Gansu Province. It was named by the Xi'an Institute of Geology and Mineral Resources in 1974, and was published in 1976 by Qinfeng and Gan Yan.
Lithology and Thickness
Slate. The Xiaputonggou Formation, 175.5 m thick, is composed of dark-grayish slate and siliceous slate intercalated with thin beds or lenses of bioclastic limestone, and its uppermost part consists of medium- to thin-bedded dolomitic bioclastic limestone and sandy limestone with calcareous slate intercalations.
Relationships and Distribution
Lower contact
It rests conformably on the Yanglugou Fm of Silurian.
Upper contact
Conformably overlain by the Shangputonggou Fm.
Regional extent
The formation, with a relatively persistent lithology and thickness, is widely distributed in Luqu, Diebu of west Qinling and north of Ruiergai.
GeoJSON
Fossils
The lower part contains Conodont Icriodus w. woschmidti; Brachiopoda Rhynchospirina-Spirigerina Assemblage Zone, and Coral Klamannipora coreaniformis-Thamonpora subelegantula Assemblage Zone; and Brachiopoda Lancemyonia-Machaeratia Assemblage Zone, and Coral Mesofavosites dupliformis-Favosites brusnitzini-Squameofavosites bohemica Assemblage Zone.
Age
Depositional setting
Additional Information