Dacangfang Fm
Type Locality and Naming
The naming section is located in an area from Yuhuangding, Danjiang City (Junxian), Hubei to Dacangfanggou, Xichuan, Henan, and the reference section is located in the Nüyangquan-Zhanggou area, Danjiang City, Hubei. Named by the Henan Petroleum Party in 1961.
Lithology and Thickness
Lower part is reddish brown and brick-red pebbly sandy mudstone and pebbly muddy sandstone with grayish white and gray sandy conglomerate or their alternating beds. Middle part is reddish brown pebbly sandy mudstone with grayish green sandy conglomerate and mudstone with grayish white and grayish green mudstone and [Upper part is ?] marlstone with gypsum and abundant calcareous concretions. The thickness is up to 500–1100 m.
Relationships and Distribution
Lower contact
Conformable contact with the underlying Early Eocene Yuhuangding Fm.
Upper contact
Conformable contact with the overlying Middle Eocene Hetaoyuan Fm.
Regional extent
This formation is mainly distributed at Dacangfang and Fanjiazhuang of Xichuan County, Henan, and Zhangwan and Youfangyuan of Danjiang City, Hubei; a similar horizon may be present in the well in the Nanyang basin.
GeoJSON
Fossils
In addition to gastropods and ostracods, crocodiles and mammals such as Coryphodon? sp., Palaeosyops sp., Lophialetes sp. and Caenolophus minimus (=Euryodon minimus) are found in the eastern part of the basin, and Kuanchuanius ? danjiangensis and Yimengia sp. are observed in the western part.
Age
Depositional setting
It is interpreted to freshwater - brackish lacustrine deposits.
Additional Information