Karamiran Gr
Type Locality and Naming
The type section is located in the Karamiran River valley in southern Aqqan, Qiemo County, Xinjiang. It was named by Zhang Yuqian et al. in 1972, and formally cited in The Paleozoic Erathem of Xinjiang in 1991.
Synonym: Karamiranhe Gr
Lithology and Thickness
Sandstone and Limestone. A suite of clastic and carbonate rocks. In the Daramiran River valley, Lower part is gray calcareous sandstone interbedded with gray-green calcareous quartz lithic sandstone and feldspar lithic sandstone, and intercalated with limestone, carbonaceous shale, tuff and basalt. Middle part is of gray-black calcareous sandstone with limestone and tuff. Upper part consists of gray-black and gray-white thin- to thick-bedded limestones intercalated with gray-green calcareous siltstone and tuffaceous sandstone. Thickness 4500 m. Westward to Kepa and the upper Yarkant River, the thickness reduced to 263 m.
Relationships and Distribution
Lower contact
Conformable contact with the underlying Tuokuzidaban Gr westward to Kepa and the upper Yarkant River Its relation with the underlying Lower Carboniferous Tuokuzidaban Gr. is unclear at the type section.
Upper contact
Conformable contact with the overlying Lower Permian Qipan Fm. Regionally, a disconformable contact is inferred to overlying Biyunshan Fm or the Yesanggang Fm. Westward to Kepa and the upper Yarkant River, the upper stratum is incompletely exposed.
Regional extent
It is widespread in the Daramiran River valley in southern Aqqan of Qiemo County, north bank of Aksu River, Akeshayi Lake, Adaoritak Mt., Purewalisikeguo Mt., etc., roughly in a NE-trending banded extension.
GeoJSON
Fossils
Lower part contains Fusulinids Schwagerina sp. and Rugosofusulina sp., and corals Lophophyllum sp. and Caninia sp.; the Middle part contains Fusulinids Triticites sp. and Schwagerina sp., and brachiopod Orthotichia sp. Upper part yields Fusulinid Rugosofusulina sp., coral Lophophyllum sp. and Ammonoid Perrinites cf. cummins.
Age
Depositional setting
It is interpreted as neritic deposits
Additional Information