Kubaimu Fm
Type Locality and Naming
North-central Qinghai. The Kubaimu Formation was named by Wang Yunshan et al. in 1980. The typical section is situated on south slope of Shiyingliang of Olongbluk Mountain in Wulan County, Qinghai Province. Lower-middle formation of Quangji Gr.
Synonym: （枯柏木组）; Gubaimu Fm
Lithology and Thickness
Lower part of the Kubaimu Formation is composed of grayish purple, white gray thick-bedded cobble conglomerate to boulderstone, intercalated with coarse- to medium-grained quartzose sandstone and pelitic siltstone. Upper part consists of light red, thick to very-thick-bedded medium- to coarse-grained pebbly quartzose sandstone and fine-grained sandstone, bearing large oblique beddings, symmetrical ripple marks and cross-bedding. The thickness is variable and generally is 129 to 355 m thick.
Relationships and Distribution
Lower contact
The Kubaimu Formation rests conformably on the underlying Mahuanggou Fm.
Upper contact
The top disconformably underlies the overlying Shiyingliang Fm with a hiatus.
Regional extent
North-central Qinghai. It is mainly distributed from the Quanji Mountain of the north Qaidam Basin to the Olongbluk Mountain area in Qinghai Province.
GeoJSON
Fossils
Age
Depositional setting
Additional Information