Taiyangling Fm
Type Locality and Naming
It was named by the Coalfield Searching and Prospecting Party of Jilin Province as the “Taiyangling Coal Series” in 1971, and was first cited publicly by the Compiler
Jingeng Sha (coordinator) Group for the Regional Stratigraphic Chart of Jilin Province, and was renamed as the Taiyangling Formation in 1978. The naming section is located in the Banshidingzi area extending to the Taiyang Ridge of Shuangyang County, Jilin Province, with its reference section being situated in the vicinity of the Jiguan Mts about 2 km south of the Wujia Coal Mine.
Synonym: （太阳岭组）
Lithology and Thickness
Lower part is composed of medium- and fine-grained sandstones intercalated with gritstone, thin-bedded conglomerate, siltstone, mudstone and coal beds. Upper part is composed of conglomerate, intercalated with sandstone and thin-bedded acid volcaniclastics; with a thickness of about 1144 m.
Relationships and Distribution
Lower contact
Its basal part is in a disconformable contact with the underlying Banshidingzi Fm. It Nanloushan region of Jilin, the schematic stratigraphic column indicates it can be unconformable on the late Triassic Lujiatun Fm.
Upper contact
Regionally, the next younger unit is indicated as Xiajiajie Fm
Regional extent
It is distributed largely in the areas of Taiyang Ridge, Liushuhezi and Bamianshi of the Shuangyang Basin. In addition, the conglomerates intercalated with volcanic clastic deposits exposed in the area of Sihetun Village of Huadian County may also belong to the formation.
GeoJSON
Fossils
It yields plant fossils as represented by the middle-stage assemblage of the Coniopteris-phoenicopsis flora, component members of which are Equisetum multidentatus, E. cf. laterale, Neocalamites sp., Todites williamsoni, Coniopteris hymenophylloides, Cladophlebis argutula, C. asiatica, Nilssonia sp., Ginkgo sp., Phoenicopsis sp., Czekanowskia rigida, C. setacea and Taeniopteris sp.
Age
Depositional setting
The formation represents fluvial and swamp-facies deposits in the intermontane basins.
Additional Information
Age:
Schematic strat column suggests Aalenian age.
Age span:
Beginning stage: Aalenian
Fraction up in beginning stage: 0.0
Beginning date (Ma):
Ending stage: Aalenian
Fraction up in ending stage: 1.0
Ending date (Ma):
Depositional setting:
The formation represents fluvial and swamp-facies deposits in the intermontane basins.
Depositional-pattern:
Additional Information
Compiler
Jingeng Sha (coordinator)