Shalitashi 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 at Shalitashi on the southern wing of an anticline north of Wucha County, Xinjiang, with its reference section being situated on the northern bank of the Yerqiang River of Aktao County. Lowermost (first) formation in Ye'erqiang Gr (= Yarkant Gr).
Synonym: （莎里塔什组）; Shalitash Fm
Lithology and Thickness
It is composed of grey and grey-green conglomerates, intercalated with a small amount of sandstone, siltstone and carbonaceous shale, with a thickness of 500-2500 m.
Relationships and Distribution
Lower contact
It overlies unconformably the Precambrian Aksu Gr or Sinian System. Regionally, the next older unit is the late Triassic Huoxiaer Fm (column TJ16) or the early Triassic Wuzunsayi Fm (column TJ17).
Upper contact
Regionally, the schematic strat column indicates the next younger unit as the Kangsu Fm
Regional extent
The formation is distributed mainly in the Tuoyun Basin till the Kangsu area east of Wucha County, and represents grey-green conglomerate, intercalated with sandstone, siltstone and carbonaceous shale. And from there on southerly, it is found to occur in the Aktao County and Duwa area of Pishan County in front of the Kunlun Mts, with its thickness reducing to 500 m, and to be intercalated with brick-red sandstone and mudstone.
GeoJSON
Fossils
It yields bivalve fossils such as Utschamiella sp., Pseudocardinia carinata, P. submagna and Sibireconcha sp., as well as plant fossils as represented by Coniopteris hymenophylloides.
Age
Depositional setting
Additional Information
Age:
Schematic strat column suggests early Early Jurassic (Hettangian-Sinemurian) age.
Age span:
Beginning stage: Hettangian
Fraction up in beginning stage: 0.0
Beginning date (Ma):
Ending stage: Sinemurian
Fraction up in ending stage: 1.0
Ending date (Ma):
Depositional setting:
Depositional-pattern:
Additional Information
Compiler
Jingeng Sha (coordinator)