Jiamuhe Fm
Type Locality and Naming
The type section is located in the southwest of the Halar-Alate Mt. in the Wulhe area of Xinjiang. It was named by the Xinjiang Petroleum Administration in 1964, and was cited publically jointly by the Department of Geosciences of the Academy of Sciences of China and the Xinjiang Petroleum Administration in 1987.
Lithology and Thickness
Volcaniciastics and Conglomerate. The Lower member of the formation is composed mainly of variegated volcanic breccia, welded breccia, andesitic tuff and rhyolitic welded tuff. The Upper member is composed largely of grey-green thick-bedded conglomeratic layers, intercalated with purplish-red sandstone bands, sandstone lenses and clayey siltstone. A fault contact separates the two members. Thickness is 3088 m.
Relationships and Distribution
Lower contact
Disconformable or unconformable contact with the underlying red siltstone layer of the Aladeikesai Fm of the upper Carboniferous Series.
Upper contact
Disconformable contact with the overlying Xiazijie Fm.
Regional extent
Distributed largely in the southeastern segment of the Hala-Alate Mt. in the Klamai subregion on the northwest margin of the Junggharyia.
GeoJSON
Fossils
Its lower part yields bryozoan, with its middle part yielding hydroids fossils and Spore-Pollen represented by Protohaploxypinus, Striatoabietites, Striatopodocarpites, Hamiapollenites, Taeniaesporites, and Vittatina, etc.
Age
Depositional setting
Lower part is interpreted as continental eruptive clastic rocks. Upper part is interpreted as piedmont alluvial deposits.
Additional Information