Azigan Fm
Type Locality and Naming
The type section is at Keziliqi, Pishan County, Xinjiang It was named by the compiling group for Regional Stratigraphical Scale of Xinjiang in 1981.
Lithology and Thickness
Limestone and Claystone. Composed of a suite of littoral-neritic carbonate rocks with minor clastic rocks. The type section is dominated by gray−gray black limestone, black−dark-gray shale, light-gray and light yellow-green sandstone intercalated with carbonaceous mudstone and purple-red nodular limestone. It is 112.7 m thick, increasing to 275.3 m westward to Yengisar, and being only 28 m eastward to Hexian County.
Relationships and Distribution
Lower contact
Conformable contact with the underlying Kalawuyi Fm
Upper contact
Conformable contact with the overlying Tahaqi Fm
Regional extent
Distributed in front of the Kunlun Mts. south of Yengisar-Yecheng-Pishan in banded shape of a NW−SE direction.
GeoJSON
Fossils
Abundant fossils, namely the Fusulinid Fusulina-Fusulinell zone, the Foraminifer Bradyina-Globivalvulina-Ammodiscus assemblage zone and the Conodont Streptognathodus parvus−S. suberectus assemblage zone, Corals Skolekophyllum rotayi, Bothrophyllum pseudoconicum and Heritschioides newsymmetricus, Brachiopods Choristites sp., Linoproductus cora, Martinia sp., etc.
Age
Depositional setting
It is interpreted as a littoral-neritic carbonate facies.
Additional Information