Kezilenur Fm
Type Locality and Naming
It was named by Yao Guofan, Tao Ruiming in 1957, and was first cited publicly by the Compiler
Jingeng Sha (coordinator) Group for the Regional Stratigraphic Chart of the Xinjiang Uygur Autonomous Region. The naming section is located at the Kezilenur gully of the Kuche County, Xinjiang (Yao Guofan, Tao Ruiming, 1957, A report on the comprehensive studies on the petroleum geology of the Kuche depression, unpublished). Uppermost formation in Kelasu Gr.
Synonym: （克孜勒努尔组）, Kyzylnur Fm (spelling).
Lithology and Thickness
Composed of an alternating layer of grey-green siltstone and black carbonaceous shale in association with grey-white quartz-sandstone, intercalated with coal beds, and with a thickness of 400-800 m.
Relationships and Distribution
Lower contact
It is in a conformable contact with the underlying Yangxia Fm.
Upper contact
Regionally schematic strat column shows this formation as uppermost unit in that Kelasu Gr; and overlain by the Sanjianfang Fm.
Regional extent
The particular formation is distributed in the areas of Kuche, Baicheng and Toksun Counties. There it is characterized by a consistent lithology, but by a greatly changeable thickness as proved by its thickness being of 843.30 m in the Kezilenur gully, and by a thickness of only 486 m in the area of Kapushaliang. In the area of Kelasu the rocks are getting coarser, with an increase in the amount of conglomerate.
GeoJSON
Fossils
It yields in the Kezilenur gully such plant fossils as Equisetites sp., Coniopteris hymenophylloides, C. tatungensis, Cladophlebis sp., Phoenicopsis angustifolia, Podozamites lanceolatus, Pityophyllum cf. lindstroemi, and Ginkgo cf. digitata. In the Kapushaliang section it yields bivalve fossils as represented by Pseudocardinia asiatica, P. elongata, P. lanceolata, P. ovalis, P. jeniseica, P. tuvensis, Ferganoconcha tomiensis and Sibireconcha anodontoides.
Age
Depositional setting
The particular formation belongs to lacustrine deposits.
Additional Information
Age:
Schematic stratigraphic column suggests Aalenian (and Bajocian, based on re-assigned age for the overlying Sanjianfang Fm).
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 particular formation belongs to lacustrine deposits.
Depositional-pattern:
Additional Information
Compiler
Jingeng Sha (coordinator)