Damitan Fm
Type Locality and Naming
It was named by He Yuanliang in 1984. The naming locality is situated at Damitan 14 km northwest of Henan Mongolian Autonomous County, Qinghai Province.
Synonym: （达米滩组）
Lithology and Thickness
Lower part represents purple and variegated conglomerate, pebble-bearing gritstone and conglomerate, intercalated with coal seams, with a thickness of 465 m. Upper part represents purple and bright-red gritstone, intercalated with conglomerate, and is ca. 866 m thick.
Relationships and Distribution
Lower contact
It is in an unconformable contact with the underlying middle Triassic series. Schematic strat column in the previous "red Chinese Lexicon" had implied that the next older regional unit is the Yangqu Fm (= Yangkyi Fm) of early-Middle Jurassic.
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Wanxiu Gr
Regional extent
This formation is also found to be distributed at Gamao (ma) Yangqu of Xinghai County, composed essentially of purple and yellow-green sandstone and mudstone, intercalated with conglomerate and pebble-bearing sandstone, with a thickness of only 50 m, yielding bivalve: Sibereconcha cf. shensiensis.
GeoJSON
Fossils
Its lower part yields bivalves Pseudocardinia aff. kweichouensis, P. sp. and plant fossils Equisetites sp.
Age
Depositional setting
Additional Information