Ertaizi Fm
Type Locality and Naming
The type section is located at Ertaizi, near Xiejiawan, south of Ganxi Village in Pinwu County, Sichuan Province. It was named by Wan Zhengquan in 1981.
Lithology and Thickness
Limestone. The formation was originally in the lower part of the Yangmaba Fm. The lithology of the formation is dominated by gray to dark-gray massive limestone and clayey limestone, intercalated with a few beds of calcareous shale, carbonaceous shale and fine-grained sandstone. It is 192 m in thickness,
Relationships and Distribution
Lower contact
It is in conformable contacts with the underlying Xiejiawan Fm.
Upper contact
It is in conformable or as a exposed surface in its contacts with the overlying re-defined Yangmaba Fm.
Regional extent
It is distributed in Beichuang and Jiangyou counties in the Longmenshan Mt. area, Sichuan Province.
GeoJSON
Fossils
Fossil zones distinguished from bottom to up are two brachiopod zones including the Otospirifer trigoeneris-Vagrania ertaiziensis assemblage zone and the Megastrophia ertaiziensis--Mesodouvillina chuangveiensis assemblage zone; two coral zones comprising the Xystriphyllum beichuanense-Hexagonaria hexagona zone and the Tryplophyllum cystosum-Sulcophyllum beichuanense zone; and also has the conodont Polygnathus serotinus (of middle Emsian)
Age
Depositional setting
Carbonate platform
Additional Information