Jinyinku Fm

The type section of Jinyinku Formation is the Huangyaogou section that is located at Huangyaogou in Jinyinku Village, north of the Xingkai Lake (132°14’00”E, 45°31’45”N). The section lies about 5 km southwest of Jinyinku Village, or about 28 km east of the seat of Mishan City. It was firstly measured by Ning Qisheng et al. from Heilongjiang Bureau of Geology in 1959, and was remeasured by Zhang Lizhu et al. in 1980. In the type section, neither the lower nor the upper boundary is exported, and the exposed formation is 1183.22 m thick. The Jinyinku Formation was first published by Compiling Group for Heilongjiang Regional Stratigraphic Scale (1979). The name is derived from Jinyinku Village, Mishan City (county level), Jixi City, southeastern Heilongjiang Province. The name was originally appeared in a 1975 manuscript by Zhang Guohua from Heilongjiang Institute of Geology. Originally the unit was called Jinyinku Carbonate Fabric, and was renamed Jinyinku Formation by Heilongjiang Bureau of Geology and Mineral Resources (1984).

Synonym: （金银库组）

The Jinyinku Formation is a metamorphosed carbonate sequence. Lower part, which is called the Marble Member, is 908 m thick, consisting of cream white marble, striped marble, carbonaceous marble and diopside-marble. Upper part, the Sandy Slate Member, is 275.02 m thick, consisting of silty phyllitic slate, argillaceous slate, and silty slate, intercalated with interbeds of marble.

No fossil has been found in the formation