Fanjiatang Fm
Type Locality and Naming
Named by Li Yuyao, Li Jie and Zhu Sen in 1935. The named section is located near Fanjiatang, south of Longtan Town, Nanjing; the reference section is located near Zijinshan Observatory, Nanjing. It was part of the Huangma Green Shale when it is named. In 1935, Li Yurao and others delineated the upper coal-bearing black shale and named it the Fanjiatang coal measure. See Huangmaqing Fm for details on nomenclature and definitions.
Synonym:
Lithology and Thickness
It is mainly dark gray, gray-black siltstone, fine sandstone, quartz fine sandstone with sandy mudstone and coal seam. It is 224.8 m thick.
Relationships and Distribution
Lower contact
At the bottom, the dark gray gravelly siltstone is in integrated contact with the underlying reddish Huangmaqing Fm = the change in color upward from purple-red to gray-black of the siltstone.
Upper contact
At the top, it is in pseudo-integrated contact with the overlying gray-white quartz conglomerate of the middle and upper Jurassic Xiangshan Gr (Xiangshan Fm).
Regional extent
The lithology of this group does not vary much, and the distribution is very sporadic, which is seen in the area of Longtan, Nanjing, with a thickness of 18 m. The thickness of the borehole data from Fanjiatang East, Baohua, Jurong County is greater than 214 m. It can be compared with the Wuzao Fm in Zhejiang, the Lalijian Fm in Anhui, the Xujiahe Fm, the Erqiao Fm and the Shazhenxi Fm in Sichuan, Hubei, Guizhou, and the Anyuan Fm in Hunan and Jiangxi.
GeoJSON
Fossils
Dictyophyllum—Clathropteris, Plant fossils: Todites shensiensis, Ptilozamites chinensis, Dictyophyllum nilssoni, etc.; bivalves: Unio, Modiolus, Waagenoperna, etc.
Age
Depositional setting
Additional Information