Baohuoyan Fm
Type Locality and Naming
It was named by Jin Chuntai et al in 1989. The nominative section is located along the roadside from Longdanxi to Maliuqiao, east of Erlangshan Mts. in west Sichuan Province.
Synonym: (爆火岩组)
Lithology and Thickness
The formation is 164 m in thickness. Lower part consists of dark grey thick-bedded coarse crystallized limestone, marl intercalated with thin-bedded mudstone. Middle part consists of dark grey, light grey dolomite with dolomitic siltstone. Upper part is grey thick-bedded crystallized limestone.
Relationships and Distribution
Lower contact
It is in continuous conformity with the underlying Changyanzi Fm.
Upper contact
It is overlain by the Yanziping Fm by parallel unconformity (Wenlock through middle Ludlow is absent).
Regional extent
The formation, as known so far, is merely distributed in the Erlangshan Mts. area in west Sichuan Province.
GeoJSON
Fossils
It yields normal neritic brachiopod Stegerhynchus, Eospirifer, Whitfieldella, Nucleospira, Striispirifer, nautiloid Gordoceras and conodont in the lower part. No fossils, except the conodont Guizhouprioniodus guizhouensis, can be found in the middle-Upper part of the formation.
Age
Depositional setting
Additional Information