Kushuixia Fm
Type Locality and Naming
It was named by the Compiler
Jingeng Sha (coordinator) Group for the Regional Stratigraphic Chart of Gansu Province in 1980. The naming section is located in the Kushui Gorge 8 km north-east-east of Shuiquan Township, Jingyuan County, Gansu Province.
Synonym: （苦水峡组）
Lithology and Thickness
Lower part is composed of an alternating layer of violet-red clay shale and grey-green shale. Middle part is violet-red clay shale. Upper part is alternating layers of violet-grey sandstone and clay shale, with a total thickness of 504 m.
Relationships and Distribution
Lower contact
Unconformably underlies the early Cretaceous Hekou Gr
Upper contact
It conformably overlies the middle Jurassic Xinhe Fm
Regional extent
The formation is distributed in the areas of Shandan, Sunan, Wuwei and Jingyuan Counties of Gansu Province.
GeoJSON
Fossils
It yields conchostracans as represented by Euestheria Compiler
Jingeng Sha (coordinator); Ostracoda such as Darwinula sarytirmenensis, D. cf. magna, Metacypris caneiformis, Djungarica sp.; Chareae as represented by Aclistochara lufengensis, A. yunnanensis, A. nuguishanensis and Stellatochara sublavis, as well as Gastropoda fossils.
Age
Depositional setting
Both the lithology and the contents of the fossils of the formation have indicated that it belongs to lacustrine deposits.
Additional Information
Age:
Schematic strat column suggests Callovian age
Age span:
Beginning stage: Callovian
Fraction up in beginning stage: 0.0
Beginning date (Ma):
Ending stage: Callovian
Fraction up in ending stage: 1.0
Ending date (Ma):
Depositional setting:
Both the lithology and the contents of the fossils of the formation have indicated that it belongs to lacustrine deposits.
Depositional-pattern:
Additional Information
Compiler
Jingeng Sha (coordinator)