Yuanshan Member

Geology

Group: Meishucunian

Formation: Qiongzhusi

Lithologies: mudstone (16), siltstone (1), dolomite (1), phosphorite (1)

Paleoenvironments: carbonate indet. (1), marginal marine indet. (15), coastal indet. (1)

Age range: Atdabanian or 521.00000 to 516.00000 Ma