Dakeng Fm
Type Locality and Naming
The type section is located in Coal mine of Dakeng Village, Zhangping County, Fujian Province, which was named by 303 geological group of Fujian Geological Bureau in 1964. It was interpreted to formed during early to middle Late Triassic by Tongshun Zhou in 1978, based on the floral assemblages.
Synonym:
Lithology and Thickness
Lower part of this formation is mainly dark grey fine-grained sandstone, siltstone and mudstone with coal stem. The upper part is dominated dark grey siltstone, mudstone intercalated with fine-grained sandstone. Thickness is about 121-160 m.
Relationships and Distribution
Lower contact
Upper contact
Displayed unconformity with the overlying Wenbinshan Fm. However, the Dakeng formation was deposited continuously to the overlying Wenbinshan Fm in Dakeng region.
Regional extent
This formation was mainly distributed in Daleng and peripheral small basins in Zhangping. Sequences were mostly well-exposed in Dakeng region, with best coal and the thickness reached 428 m. but the thickness decreased northwardly, with sediments coarsening-upwards. Thickness in the north part of Wuling was only 160 m and was 121 m in the south part of Qianban.
GeoJSON
Fossils
Plants: Neocalamites carrerei, Clathropteris menscioides, Glossophyltum? sp., Podozamites lanceolatus. Conchostracans: Euestheria cf. indiani, Lingulocaris hoplonni. Bivalves: Gervillia yongshanensis, Myophoriopsis aoyrus, Modiola furgi, Unionites tenebericsa
Age
Depositional setting
Marine-terrestrial interbedded facies
Additional Information