薄板状灰岩夹微细薄层粉砂质泥岩，呈不等厚韵律层。为早三叠下斜坡碳酸盐岩夹碎屑岩浊流沉积产物。早三叠世下斜坡碳酸盐岩夹碎屑岩浊流沉积产物的地质年代可以追溯到始新世，底界大致为50Ma B.P.（百万年前），顶界为40Ma B.P.。这意味着这些沉积物的形成时间大约在5000万到4000万年前。

Laminated limestonesinterbededthin layer silty mudstone of different thickness rhythmic layers, which was the sediment of early Triassic carbonate of rock slope interbed turbidite. The geological age of turbidite deposits of carbonate rocks with clastic rocks on the lower slope of the Early Triassic can be traced back to the Eocene, with a bottom boundary of about 50mA B.P. (million years ago) and a top boundary of 40mA B.P. This means that these sediments were formed about 50million to 40million years ago.