Xiaohekou Fm
Type Locality and Naming
Central-north Yunnan (border with southernmost Sichuan). The Xiaohekou Fm was named by Wang Kenan et al. in 1963. The naming locality is Xiaohekou, Dongchuan City, Yunnan Province. The reference section is at Xiaoheiqing-Pudu River, northwest of Dongchuan City, Yunnan Province. Middle formation-level stratigraphic unit of the Kunyang Gr in the Dongchuan area.
Synonym: （小河口组）
Lithology and Thickness
The formation is dominated by grey, grey-white quartz sandstone and quartzite accompanied with dark-grey slate. The lower part is often intercalated with ferruginous slate, hematite and limonite beds. The sandstone bears oblique bedding and ripple marks. There are often a ferruginous breccia, ferruginous sandstone and ferruginous sericite slate at the top of the formation. The thickness varies from 765 to 1800 m.
Relationships and Distribution
Lower contact
It is in conformable contact with the underlying Dayinpan Fm
Upper contact
The top is conformably overlain by the Madi Fm
Regional extent
Central-north Yunnan (border with southernmost Sichuan). It is exposed only around the Dongchuan area.
GeoJSON
Fossils
Age
Depositional setting
Additional Information