Wanbao Fm
Type Locality and Naming
It was named by the No. 217 Party of the Coalfield Administration of Jilin Province in 1960, and was first cited publicly by the Compiler
Jingeng Sha (coordinator) Group for the Regional Stratigraphic Chart of Jilin Province. The naming section is located in the area of the Wanbao Coal Mine of Tao’an County, Jilin Province, with its reference section being situated in the Dusheng Village of Tuquan County.
Synonym: （万宝组）
Lithology and Thickness
Lower part is composed of grey-black and grey siltstone and poststone, intercalated with sandy conglomerate and mineable coal beds, with a thickness of 165-730 m. Upper part is composed of lithic crystal tuff, tuffaceous gritstone and sandy conglomerate, intercalated locally with thin coal beds, with a thickness of 150-830 m.
Relationships and Distribution
Lower contact
Its basal part is in an unconformable contact with the underlying Hongqi Fm
Upper contact
Regionally, the next younger unit is indicated as Xinmin Fm
Regional extent
It is distributed extensively in the areas of Lianhe Village, Huanghua Mts of the Zhalate Banner, the Gejiatun Village of Korxin Right Central Banner, the Huawujiu Mts of Budunand Heishanding of Tuquan County, and Mongniuhai of Balin Left Banner (Lindong), Inner Mongolia, in addition to the Wanyihong Coal Mine of Tao’an County, Jilin Province. Partly coeval with Xinmin Fm.
GeoJSON
Fossils
It yields plant fossils of the middle-stage assemblage of the Coniopteris-Phoenicopsis flora, whose important members tend to comprise Neocalamites sp., Equisetum laterale, Todites williamsoni, Coniopteris hymenophylloides, Eboracia lobifolia, Cladophlebis asiatica, Raphaelia diamensis, R. stricta, Anomozamites sp., Ginkgo ex gr. sibirica, Baiera gracilis, Sphenobaiera spp., and Phoenicopsis speciosa, as well as bivalve fossils as represented by Ferganoconcha tomiensis and F. anodontoides
Age
Depositional setting
The formation belongs to fluvial-lacustrine and swamp-facies coal-bearing deposits formed in the intermontane faulted basins, associated with weak volcanic eruptive activities.
Additional Information
Age:
Age span:
Beginning stage: Aalenian
Fraction up in beginning stage: 0.0
Beginning date (Ma):
Ending stage: Bajocian
Fraction up in ending stage: 1.0
Ending date (Ma):
Depositional setting:
The formation belongs to fluvial-lacustrine and swamp-facies coal-bearing deposits formed in the intermontane faulted basins, associated with weak volcanic eruptive activities.
Depositional-pattern:
Additional Information
Compiler
Jingeng Sha (coordinator)