Shizigou Fm
Type Locality and Naming
Qaidam Basin. The type section is the Shigaodian section of the Shizigou structure in the western part of the Qaidam basin, Qinghai. Originally named the Shizigou rock series by Zhu Zonghao et al. in 1959 and renamed the Shizigou Formation by Fei Wenzhong et al. in 1963.
Lithology and Thickness
Yellowish gray conglomerate and pebbly sandstone with small amounts of muddy sandstone and mudstone. The thickness is ~670 to 2340 m.
Relationships and Distribution
Lower contact
It has an unconformable or conformable contact with the underlying Neogene Youshashan Fm.
Regional extent
Distributed in the Qaidam Basin.
GeoJSON
Fossils
Ostracods: Eucypris conainna, Microlimnocythere sinensis; Gastropods: Valvata, Succinea, Radix; Primate: Pliopithecus bii; Charophytes: Charites, Tectonchara; Chenopodiaceae: Artemisiaepollenites, Ephedripites;
Age
Depositional setting
In the basin center, its lithology becomes fine, containing gypsum and halite, with lacustrine deposits being dominant. On the basin margins, the formation consists predominantly of piedmont alluvial-diluvial deposits with fluvial deposits.
Additional Information