Gulanhe Fm
Type Locality and Naming
It was named by the First Party of Regional Geological Survey of the Heilongjiang Bureau of Geology in 1977 and published by Xue Chunding et al in 1980. The type section is on the southern bank of Xigulan River, approximately 10 km northwest of the 727 Forestry Centre in Aihui County, Heilongjiang Province.
Synonym: （古兰河组） ; The Bureau of Geology and Mineral Resources of Heilongjiang Province assigned this formation and Xigulanhe Fm, Niqiuhe Fm, Handaqi Fm and Jinshui Fm to Niqiuhe Fm in 1997. [The age of the Niqiuhe Fm is from top Silurian to the Middle Devonian]. The name of Gulanhe Formation is reserved herein for the need of more precise classification and correlation of the strata in this area.
Reference Section:
The reference section is on the western bank in the lower reaches of Daheli River, about 25 km east of Duobaoshan, Nenjiang County.
Lithology and Thickness
It was dominated by grey green, dark green slate and siltstone, locally with pebbled greywacke intercalated with minor andesite, rich in tuffaceous material. It is 53 m thick at the type section area.
Relationships and Distribution
Lower contact
The formation conformable contacts with the underlying Woduhe Fm
Upper contact
The formation conformable contacts with the Xigulanhe Fm of the Devonian.
Regional extent
The formation is exposed only in the area of Nenjiang and Aihui counties. It is steady in lithology, but clastics become courser and the thickness increases from northeast to southwest. The thickness of the formation is up to 170 m thick in Guanwuhe area of Nenjiang County.
GeoJSON
Age
Depositional setting
The formation is an intertidal facies deposit.
Additional Information