Songlingou Fm

The type section is located at Dazhaimen, west of Shidian County, Yunnan Province.

It was named by Yang Jikai in 1984.

Limestone. The Formation is divided into two Members: Lower, Xibiantang Member (used as Malutang Fm here), is characterized by grayish medium- to thick-bedded limestone intercalated with dolomitic limestone, purple gray thin bedded clayey limestone and calcareous mudstone, 60-100 m thick.

Upper, Malutang Member (used as Malutang Fm here), is characterized by yellow clayey limestone, calcareous mudstone and bioclastic limestone, 88 m thick

Lower, Xibiantang Member contains ammonoids Mimagoniatites fecundus, brachiopoda Strophochonetes spp. Upper, Malutang Member yields abundant brachiopods: Emanuella inflata, Bifida lepida, Eoreticulariopsis sp., Strophochonetes sp.