Cuipingshan Fm
Type Locality and Naming
The type section is located at Cuiping Mt. to the east of Longyan City Town, Fujian Province, with its reference section being situated in the area of Maotaokeng Village, 8 km to the east of the Longyan City Town. It was named by Hou Defeng, Wang Yuelun and Zhang Zhaojin in 1935.
Synonym: Shahu Fm (Guangzhou)
Lithology and Thickness
Clastics. Composed chiefly of fine-grained sandstone and siltstone, intercalated with coal seams, locally with claystone. Its basal part is composed of pebble-bearing sandstone, with its pebbles being mainly of cherts, and a small amount of those from sandstone and limestone; with the pebbles from limestone yielding Fusulinida such as Schwagerina sp., and Nankinella sp.; and with its upper part containing oolites of siderite. Thickness is 495 m.
Relationships and Distribution
Lower contact
Disconformable contact with the underlying Tongziyan Fm
Upper contact
Conformable contact with the overlying Dalong Fm, and with the occurrence of the light-purple thin-bedded fine-grained sandstone serving as a boundary-dividing mark.
Regional extent
The formation is lithologically stable, and is distributed in the southwestern part of Fujian Province and northeastern part of Guangdong Province, with the greatest thickness being found in the Yongan and Yongding areas, ranging from 554 m to 647 m, and from there westerly granularity of rocks is getting smaller, the amount of sandstone is decreasing, thickness of the formation is reducing and the coal-bearing capacity is getting better. In the Liancheng and Jiangle areas its thickness is of 206-273 m, with its lower part being possessed of minable coal seams. Easterly the granularity of rocks is getting coarser, and thickness is getting smaller. Till Dehua County and Shangtao area of Yongchun County the formation is predominated by sandstone, with a thickness of about 180 m.
GeoJSON
Fossils
Plant fossils represented by the Gigantopteris-Lobatannularia assemblage. Its upper part also yields Brachiopods such as Oldhamina squamosa, Spinomarginifera kueichowensis, Waagenites barusiensis, Orthothetina ruber, etc.; Ammonoids represented by Pseudogastrioceras sp.; bivalves as represented by Phestia sp., Nuculana sp., Wilkingia sp., etc.
Age
Depositional setting
It is interpreted as paralic-facies clastic deposits.
Additional Information