Baihaba Fm
Type Locality and Naming
The type section is at area northeast of Baihaba (86°48′35″E, 48°43′25″N), measured by the No.6 Team of the Xinjiang Party of Regional Geological Survey in 1980. The Baihaba Formation was named by Wang Guangyao from the No.6 Team of the Xinjiang Party of Regional Geological Survey during 1:200000 scale geological surveying in Habahe-Halas region (1980), and was published by Xiao Bing (1990). The name is derived from Baihaba Village in Habahe County, Northern Xinjiang.
Synonym: (白哈巴组)
Lithology and Thickness
The Baihaba Formation is represented by unequal thick interbeds of gray-green muddy siltstone, silty mudstone and light gray limestone intercalated with crystalline limestone lenses. In the type section the formation records an incomplete thickness of 1280 m.
Relationships and Distribution
Lower contact
The formation rests conformably on the tuff in the upper part of the Dongxilek Fm
Upper contact
With a covered top boundary. Regionally, the next younger unit is the Kulumuti Gr of upper Silurian.
Regional extent
The Baihaba Formation is distributed at Baihaba, middle-upper reaches of the Haba River, and Asubai, west of Aletai (Xiao, 1990).
GeoJSON
Fossils
The unit yields corals Sibiriolites sp. and Tryplasma sp.; brachiopods Storphomena sp., Dalmanella sp., Cyrtonotella sp. and Leptaenella; bryozoan Leioclema sp. In the vicinity of the type area, corals Plasmoporella sp. and Heliolites sp.; brachiopods Sowerbyella sp. and Plectatripa sp.; trilobite Illaenus sp. have been also found.
Age
Depositional setting
The formation represents shallow sea environments.
Additional Information