Shuixiakou Fm
(70), Capitanian Stage (late Guadalupian Epoch; late-Middle Permian)
Type Locality and Naming
The type section is located at Shuixiakou of the Yudoutan area 35 km to the southeast of the Zhenan County Town, Shaanxi Province. It was named by Chinese Academy of Geological Sciences in 1963.
Lithology and Thickness
Shale and Limestone. Its basal part is composed of black shale and sandy shale. Lower part is composed of dark-grey medium-bedded micritic siliceous limestone, intercalated with thin-bedded limestone and shale. Upper part is composed of black thin-bedded siliceous micrite, intercalated with yellow-green medium-bedded calcareous quartz-sandstone and sandy shale. Thickness is 397.5 m.
Relationships and Distribution
Lower contact
Upper contact
Conformable contact with the dark-grey massive limestone and clayey limestone at the base of the overlying Xikou Fm
Regional extent
Distributed in the Xikou area-Yundoutan area of the Zhenan County, Shaanxi Province, meanwhile in the area of the Yunxi County of Hubei Province its thickness reaches as great as 613 m.
GeoJSON
Fossils
Yields Fusulinid fossils represented by Metadoliolina shanxiensis, M. lepida, Neoschwagerina douvillei, Yabeina shiraiwensis, Y. gubleri, etc.; Brachiopods such as Monticulifera zhenanensis, M. sipensis, Neoplicatifera huangi, Tyloplecta nankingensis; and Corals such as Tachylasma magnum, Allotropiophyllum sinensis.
Age
Depositional setting
It is interpreted as shallow-sea deposits.
Additional Information