Luotuoshan Fm
Type Locality and Naming
The type section was not given. It was named by No 2 branch Team of Heilongjiang No 2 Team of Regional Geological Survey in 1981.
Lithology and Thickness
Metamorphic sandstone. According to the sections located at Luotuoshan and Yienishan, 3 km and 6 km from northeast of Wunur respectively, and the section northwest of Zhadunhe forest Farm, the lithology of the formation is dominated by grayish-green metamorphic calcareous quartz sandstone, phyllitic calcareous slate and siltstone intercalated with bioclastic limestone and with sandy conglomerate at bottom.
It is more than 100 m thick.
Relationships and Distribution
Lower contact
It disconformably overlies the underlying Ordovician.
Upper contact
Its upper part is cut by faults, so no direct contact relation with the overlying Wunur Fm can be seen.
Regional extent
In Da Hingan Ling, this formation is mainly distributed in Wunur to Zhadunhe Forest Farm areas.
GeoJSON
Fossils
It yields brachiopods Protathyris praecursor, Cymostrophia sp., Ancillotoechia sp., Howellella sp., and coral Favosites sp., Pachyfavosites sp.
Age
Depositional setting
It is interpreted as a normal shallow-marine deposits.
Additional Information