Biyoulebaoguzi Gr
Type Locality and Naming
The type section is located in a trunk trench at Biyoule-baoguzi about 60 km to the northeast of Kuche County, Xinjiang. It was named by the former USSR No. 13 Aerogeological Survey Expedition in 1952-1953, and was publicly cited by the Compiling Group for the Regional Stratigraphic Chart of the Xinjiang Uygur Autonomous Region in 1981.
Lithology and Thickness
Conglomate and Clastics: Lower part is composed of grey and purplish red thick-bedded conglomerates, with a thickness of 73 m. Middle and Upper parts are composed of interbeds of grey-green sandy conglomerate, siltstone and sandy siltstone, intercalated with limestone. Uppermost part is composed of black shale, sandy siltstone and grey-green schistose sandstone. Total thickness of 321 m.
Relationships and Distribution
Lower contact
Angular unconformable contact with the underlying Lower Permian effusive rocks (Baledirtag Fm or Kulgan Fm) or the Carboniferous limestone (Ayilihe Fm)
Upper contact
Disconformable contact with the overlying Ehuobulak Gr (Early Triassic sandstone)
Regional extent
To the south of the Kaidu River there occurs dark-colored thick-bedded conglomerate, with no top of it being found, with a thickness of 170 m; westerly it is found to occur in the Biyoulebaoguzi trunk trench and the foreland area in between the Jiqiketao River and the Kapushaliang River, with a thickness of over 196 m, and it is 105-m thick in the upper reaches of the Akesu River.
GeoJSON
Fossils
Plant fossils: its lower part yielding the Callipteris-Comia-lniopteris assemblage, and its upper part yielding bivalves as represented by the Anthraconauta tschernyschewi, etc.
Age
Depositional setting
It is interpreted as river-facies deposits.
Additional Information