Jiaogaoshan Fm
Type Locality and Naming
The type section is located at Wenduoer (Gaojiaoshan), Yaergaiyin, Ewenki Autonomous Banner, Inner Mongolia. It was named by the No. 2 Heilongjiang Party of Regional Geological Survey in 1981.
Lithology and Thickness
Volcanics and Claystone. Dominated by a suite of sea-floor eruptive intermediate-acid volcanic rocks. At Wenduoer, Yaergaiyin, the Lower part consists of light yellow tuff and quartz-keratophyre, intercalated with black slate, mudstone and sandstone, locally of dark brown conglomerate and feldspar-rich sandstone; the Middle and Upper parts are dominated by volcanic rocks, composed of light green keratophyre, etc. Thickness 1631 m
Relationships and Distribution
Lower contact
Uncertain: neither top nor bottom is clear. Regionally, next higher unit is uppermost Carboniferous Yigenhe Fm
Upper contact
Uncertain: neither top nor bottom is clear. Regionally, next lower unit is Xiertala Fm limestone
Regional extent
Distributed in the southern Ergun Left Banner, Lingbei Station of Yakeshi City, east of Kudur Town, northern Wunuer and along Hushan to Jiaogaoshan (mountains) of the Ewenki Autonomous Banner.
GeoJSON
Fossils
Ammonoid Epicanites-Sudeticeras assemblage, including the Beyricanites sp.; brachiopods Syringothyris sp., Pseudosyrinx sp., Antiquatonia hindi, Dielasma attenuatus and Plicatifera aff. Chaoi; corals Homalophyllum sp., Bradyphyllum sp. and Rhopatolasma sp., as well as a few plants.
Age
Depositional setting
It is interpreted as sea-floor eruptions into marine clastics.
Additional Information