Kangsu Fm

Xinjiang

Jingeng Sha (coordinator) Group for the Regional Stratigraphic Chart of the Xinjiang Uygue Autonomous Region in 1981. The naming section is located in the vicinity of Kangsu region, Wuqia County, Xinjiang. Lower (second) formation in Ye'erqiang Gr (= Yarkant Gr).

Synonym: （康苏组）

Lithology and Thickness:

Composed of grey-brown sandstone and siltstone, intercalated with mudstone and shale (in the Tuoyun Basin), or being intercalated with grey-green sandstone; its lower part, with conglomerate, and its upper part, with carbonaceous shale, mudstone and coal seams (in the area of Kuslapu), and with a thickness of 200-900 m.

Lithology-pattern: Fine-grained sandstone

Relationships and Distribution:

Lower contact:

It is in a conformable contact with the underlying Shalitashi Fm

Upper contact:

Regionally, the schematic strat column indicates the next younger unit as Yangye Fm

Regional extent:

The formation is distributed chiefly in the Tuoyun Basin to Kangsu region of the Wuqia County in the foreland of the Tianshan Mts, with its intermittent distribution being found in a belt stretching from Aktara-Kuslapu (Yelqiang River) to Duwa (Karakash River) in the foreland of the Kunlun Mts, with its salient features being similar to those found in the area of the Tuoyun Basin and Kangsu region, but with its lower part being intercalated with more conglomerate. While entering the Liushitagh Mts area the Kangsu Fm is difficult to be differentiated from its underlying Shalitashi Fm, with its thickness increasing upto 2000 m and more.

GeoJSON:

Fossils:

It yields plant fossils such as Sphenobaiera longifolia, Todites williamsoni, Coniopteris hymenophylloides and Pityophyllum staratschini; bivalves fossils as represented by Pseudocardinia ovalis, P. lanceolatus and P. cf. curta (in the area of the Kuzgongsu River westerly till the Lesser Heiziwei region).

Age:

Schematic strat column suggests late Early Jurassic (Pliensbachian-Toarcian) age.

Age span:

Beginning stage: Pliensbachian

Fraction up in beginning stage: 0.0

Beginning date (Ma):

Ending stage: Toarcian

Fraction up in ending stage: 1.0

Ending date (Ma):

Depositional setting:

Depositional-pattern:

Additional Information

Compiler

Jingeng Sha (coordinator)