Bashilixiaohe Fm

It was named by the First Brigade of Regional Geological Survey, Heilongjiang Bureau of Geology in 1974, and published by the Compiling Group of Heilongjiang Regional Stratigraphical Scale in 1979. The type section is located at the east of Bashilixiaohe River, a branch of Woduhe River, about 25 km north of Duobaoshan in Nenjiang County, Heilongjiang Province. The coordinate of the type section is 125°51′E, 50°25′N.

Synonym: （八十里小河组）

Reference Section:

The reference section is at the east bank of Luohe River, about 15 km southeast of Duobaoshan, and at west bank of Dahelihe River, in the lower reaches, approximately 25 km east of Duobaoshan.

The formation is dominated by yellowish green to greyish green fine- to medium-grained feldspathic quartz sandstone and siltstone intercalated with purplish red thin-bedded siltstone. Locally the upper part may comprise intermediate or intermediate-basic volcanic rocks, tuff and volcanic breccia.

The formation yields merely brachiopod characterized by the Tuvaella rackovskii assemblage with major elements such as T. rackovskii, Howellella tapsaensis, Meristina hinganensis, etc.