Yangye Fm
Type Locality and Naming
It was named by the Compiler
Jingeng Sha (coordinator) Group for the Regional Stratigraphic Chart of the Xinjiang Uygur Autonomous Region in 1981. The naming section is located in the Wucha Coal Mine on the western bank of the Kuzygongzu River, with the section on the southern bank of the Yarkant River of Arketao County and the Kurjirga section in the Kyzyl region, Xinjiang serving as its reference sections. Upper (third of four) formation in Ye'erqiang Gr (= Yarkant Gr).
Synonym: （杨叶组）
Lithology and Thickness
The formation is composed of grey and grey-black schistose mudstones, intercalated with thin-bedded and massive sandstones, carbonaceous mudstones and thin layers of marls, coal beds and a small amount of conglomerates, with a thickness of 544 m.
Relationships and Distribution
Lower contact
It is in a conformable contact with the underlying Kangsu Fm. In the area of salt-works the formation overlies directly the Proterozoic strata.
Upper contact
It is in a conformable contact with the overlying Ta'erga Fm
Regional extent
The particular formation is distributed on the southern foothill of the Tianshan Mts and the northern foothill of the Kunlun Mts. Within the Kunlun Mts (the Gongger Mts and Arqiang region) and on the southern margin (the Yingjisha region) of the Tarim Basin the particular formation has not been subdivided clearly yet.
GeoJSON
Fossils
It yields bivalve fossils such as Pseudocardinia carinata, P. turkensis, P. asiatica, P. sibirensis, P. elongata, P. lanceolata, P. ventricosa, P. ferganensis and Sibireconcha anodontoides; Gastropod fossils as represented by Bithynia sp.; and plant fossils as represented by Coniopteris hymenophylloides and Todites williamsoni.
Age
Depositional setting
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:
Depositional-pattern:
Additional Information
Compiler
Jingeng Sha (coordinator)