Kumasu Fm
Type Locality and Naming
The type section is located at the Zhenge River southeast of Hongshanzui, east of Altay and the Kumasudaban area, Xinjiang. It was named by the Regional Geological Survey Party of Xinjiang Bureau of Geology in 1978, and formally cited in The Paleozoic Erathem of Xinjiang in 1991.
Lithology and Thickness
Claystone. Dominated by gray, dark-gray, gray-black, yellow-green and brown thin-bedded silt-bearing clayey slate, calcite chlorite-slate, silt-bearing calcareous slate and calcareous siltstone, intercalated with medium-grained feldspar-rich sandstone, polymineralogic sandstone and minor sandy limestone. Visible thickness 755.8 m.
Relationships and Distribution
Lower contact
Unknown: Faulted contact with the underlying Devonian System
Upper contact
Unknown: Faulted contact with the overlying Hongshanzui Fm
Regional extent
Distributed at the Zhenge River southeast of Hongshanzui (on the Sino-Mongolia border), northeast of Altay Town, and the Kumasudaban area east of Altay, Xinjiang.
GeoJSON
Fossils
Containing Brachiopods Cyrtospirifer sp., Mucrospirifer sp., Chonetes sp., Linoproductus sp. and Tenticospirifer sp.; Coral Barandophyllum sp.; Bivalves Eopteria? sp., Lunulicardium sp. and crinoid stem Cyclocyclicus, etc.
Age
Depositional setting
It is interpreted as a neritic clastic lithofacies, with the sandstone and mudstone commonly characteristic of low-grade metamorphism.
Additional Information