Xiangcheng Fm
Type Locality and Naming
The type section is located in Xiangcheng Town, Gao'an County, Jiangxi Province. It was named by Sun Cunli in 1988. This set of strata was generally called Daye Fm or Daye Gr in Jiangxi, before it was named by Sun Cunli in 1988. In 1992, Wang Zunzhou et al. expanded the lithostratigraphic range of the formation, and classified the upper limestone of the Tieshikou Fm in northern Jiangxi as part of this formation
Synonym:
Lithology and Thickness
It is characterized by carbonate rock. Lower member consists of 34 to 269 m gray medium-thick limestone and a small amount of shale intercalation. Upper member is thick layers of greyish white, gray and pink dolomite, dolomitic limestone and oolitic dolomite, and the bottom is brecciated dolomite. The total thickness is 180 to 648 m
Relationships and Distribution
Lower contact
It is conformable in contact to the underlying Tieshikou Fm [but the schematic stratigraphic column has a Yuanxi Fm between.]
Upper contact
The top has a bed of dolomite and is conformable in contact to the purple sandstone of the overlying Yangjia Gr.
Regional extent
This formation is mainly distributed in Xiushui, Ruichang, Shanggao, Yichun, Gao'an and Jingdezhen in northern Jiangxi Province. Coeval with Yuanxi Fm in same general region.
GeoJSON
Fossils
Rare in fossils. The lower part contains a few bivalves Leviconcha cf. praeorbicularis and conodonts Neospathodus cf. dieneri. The upper segment contains the bivalves Pachycladina obliqua, Parachirognathus sp., Neogondolella sp., etc.
Age
Depositional setting
The formation is a semi-enclosed shallow marine deposit.
Additional Information