Shizuizhi Fm

The type section is located at Quanling, Shizuizhi Town, Panshi County, Jilin. It was named by the Changchun College of Geology and Jilin Party of Regional Geological Survey in 1961.

Limestone and Sandstone. Low-grade metamorphic marble and fine-grained clastic rock. At Quanling, the formation consists of white and gray-white marble, banded marble and marbleized crystalline limestone in the lower part; of metamorphic fine-grained sandstone and sandy shale in the top. Middle part is dominated by thin-bedded clayey limestone and marble-ized limestone intercalated with foliated shale and marble in the middle part. Upper part is composed of light yellow foliated tuffaceous fine-grained sandstone, sandy shale as well as phyllite-shales and foliated shales. Exposed thickness 1000 m.

The formation is incompletely exposed in various places, and its variation rules in thickness and lithofacies are unclear. But there is a general northward trend of increasing limestone and decreasing clastic rock.

Fusulinids Pseudoschwagerina sp. and Schwagerina sp. as well as massive crinoid stems at the type section. Elsewhere, the fossil fusulinid assemblages are dominated by Pseudoschwagerina in the upper part, including P. uddeni, P. Borealis, Schwagerina anderssoni, S. longissmoides, Rugosofusullina vacuta, etc.; and by Triticites in the lower part, including T. mogutovensis, T. laxus, Schwagerina cf. mutabilis, etc.