Jiuligang Fm
Type Locality and Naming
It was named by Chen Gongxin in 1975. The named section is located in Jiuligang, Yuan'an County, Hubei Province.
Synonym:
Lithology and Thickness
It is mainly composed of yellow-gray, yellow-brown siltstone, argillaceous siltstone, mudstone and carbonaceous shale, interbedded with feldspar quartz sandstone and fine sandstone. The thickness is 278 ~ 378 m.
Relationships and Distribution
Lower contact
The conformational contact is between conglomerate and underlying yellow-green silty marl of Badong Fm at the bottom. [However, regionally, the Badong Fm is also overlain by the Yingzuishan Fm.]
Upper contact
The conformational contact to the overlying Wanglongtan Fm is between conglomerate and overlying yellow-brown feldspar quartz sandstone at the top.
Regional extent
The lithology and thickness of this formation vary greatly and the distribution is limited. It is mainly found in Nanbar-Jingshan District of Hubei Province. Haihuigou in Jingmen County in the east is dominated by quartz sandstone with siltstone and carbonaceous shale with thickness of 416 to 540 m. To the west, it is 278 to 378 m in Yuan 'an, 250 m in Dangyang County, and 360 to 500 m in the north. The strata are equivalent to the lower coal formation of Xiangxi Gr. Coeval with lower Shazhenxi Fm in nearby region.
GeoJSON
Fossils
There are many fossils, including plants, bivalves and conchostracan.
Plants: Danaeopsis fecunda, Bernoullia zeilleri, Dictyophyllum nathorsti, Clathropteris meniscioides, Lepidopteris ottonis, Cycadocarpidium erdmanni
Bivalves: Utschamiella sp.
Age
Depositional setting
Additional Information