Mohe Fm
Type Locality and Naming
It was named by the Map Compiler
Jingeng Sha (coordinator) Group under the Chinese Academy of Geological Sciences of the former Ministry of Geology in 1963, and was first cited publicly by the Compiler
Jingeng Sha (coordinator) Group for the Regional Stratigraphic Chart of Heilongjiang Province. The naming section represents the former Wusuli-River section of carbonaceous shale-sandstone association located in the vicinity of the Wusuli River on the right bank of the upper reaches of the Heilong River, with the N35 P12 profile in the Beishan Mts 18 km apart from No. 2 branch line of the Xiufeng Township, Tahe Town serving as its reference section. Upper (second) formation in Emurhe Gr.
Synonym: （漠河组）
Lithology and Thickness
Characterized chiefly by rhythmic sedimentation of yellow-brown and grey-yellow conglomerates, pebble-bearing sandstones, grey-black argillaceous siltstones and carbonaceous shales, with its lower part being intercalated with calcareous and argillaceous siltstones and thin-bedded black-grey microcrystalline limestones, and with its upper part containing tuffaceous conglomerates, carbonaceous mudstones, intercalated with cellular poor-quality coal, with a thickness of over 3550 m.
Relationships and Distribution
Lower contact
It is in a conformable contact with the underlying Ershi'erzhan Fm
Upper contact
It is in a conformable contact with the overlying Kaikukang Fm
Regional extent
The formation is distributed largely in the Upper Heilongjiang Depression, and is exposed on the surface in the Jibei area of Xilin County, as well as in a zone extending from the lower reaches of the Dasika River on the west along the Heilong River easterly to the Yongan Railway Station and Guzhan Station east of the Mohe River in the form of a E-W-trending belt. There are found widespread exposures of the formation in the area of the No. 22 Railway Station till the Kakukang Township, the area of the No. 21 Railway Station till the Yixiken region, and at 18 km of the No. 2 Branch Line of Xiufeng Township of Tahe Town, with less changes in its lithology. In 1978 the No. 2 Regional Survey Party of Heilongjiang Province created the Emurhe Formation as a synonym for the formation.
GeoJSON
Fossils
It yields plant fossils as represented by Podozamites lanceolatus, Raphaelia diamensis, Cladophlebis denticulate, C. argutula, C. cf. raciborskii, Ginkgoites cf. sibiricus and Nilssonia orentals, in addition to Ostracoda, bivalve and Gastropoda fossils.
Age
Depositional setting
Additional Information
It yields plant fossils as represented by Podozamites lanceolatus, Raphaelia diamensis, Cladophlebis denticulate, C. argutula, C. cf. raciborskii, Ginkgoites cf. sibiricus and Nilssonia orentals, in addition to Ostracoda, bivalve and Gastropoda fossils.
Age:
Schematic stratigraphic columns suggests Bathonian age.
Age span:
Beginning stage: Bathonian
Fraction up in beginning stage: 0.0
Beginning date (Ma):
Ending stage: Bathonian
Fraction up in ending stage: 1.0
Ending date (Ma):
Depositional setting:
Depositional-pattern:
Additional Information
Compiler
Jingeng Sha (coordinator)