Wuxingzhen Fm

The type section is represented by the underground columnar section of the drill holes ZK50 and ZK59. It is located at the Wuxingzhen Lead-Zinc Mine in Wuying District, Fenglin County, Yichun, Heilongjiang Province (129°20’10” E, 48°10’30” N). The drill hole section, worked by the No.707 Geology Team of Heilongjiang Bureau of Metallurgy in 1978, lies about 22 km west of the seat of Fenglin County. The core of the formation from the drill hole is over 199.03 m in thickness. The Wuxingzhen Formation was first published by Xiang (1981a). The name is derived from Wuxingzhen Township, Fenglin County, Yichun City, central Heilongjiang Province. It appeared originally in a 1978 manuscript by the members from the No.707 Geology Team of Heilongjiang Bureau of Metallurgy and a 1979 meeting abstract of Guo Hongjun and Duan Jiye from Changcun College of Geology.

Synonym: （五星镇组）

The Wuxingzhen Formation is a metamorphic carbonate sequence, consisting mainly of white marble with interbeds of dolomitic marble in the Lower part; grey marble with interbeds of carbonaceous slate and silty slate in the Middle part; and carbonaceous slate and silty slate with interbeds of grey marble and greyish black marbleized limestone.

In the upper part, the formation yields trilobites Inouyina yichunensis, Jangudaspis cf. princeps, Kootenia yichunensis, Laminurus insuetus, Neacobboldia yichunensis, Onchocephalina yichunensis, Pagetia cf. primaeva, Proerbia sinensis, Pseudosacanthopsis yichunensis, and Solenopleurella sp. This part also yields brachiopods Acrothele sp., Lingulella sp. and Obolus sp. Lingulella sp., and small shelly fossils Stenothecodes spp. and hyolithids Camena sp., Circotheca? sp., Hyolithellus sp. and Palaeasulcachites? Irregularis. (Duan and An, 2001).