Badu Fm
Type Locality and Naming
The type section is located at Badu Village, 42 km north of Minshan (now Zhuoni County), Gansu Province. It was named by Ye Lianjun and Guan Sicong in 1944.
Lithology and Thickness
Siltstone and Sandy limestone. Dominated by clastic rocks, consisting of dark-gray clayey siltstone, sandy limestone and calcareous conglomerate intercalated with sandstone, as represented by the Baoshekou section on right bank of the Zhaohe River 50 km northeast of Lintan. Thickness over 525 m. Locally with pyroclastic rock around the Demuqiang gulf in Xiahe of the western area.
Relationships and Distribution
Lower contact
Unconformable over the Wangjiadian Fm (Dev column 21), the top of which being cut off by fault. Regionally (Dev column 36; middle Qinling), the next older unit can also be the Jiehejie Fm ?
Upper contact
Regionally, the next younger unit is the Xiajialing Fm.
Regional extent
Distributed along Wangatan of Xiahe and Yeliguan of Lintan, Gansu.
GeoJSON
Fossils
Brachiopods Gigantoproductus sp., Striatifera sp., etc., Corals Lithostrotion sp., Aulina sp., Kueichouphyllum sp., Dibunophyllum sp., etc. and Fusulinid Eostaffella sp., etc.
Age
Depositional setting
It is interpreted as littoral-neritic sediments.
Additional Information