Ahe Fm

Xinjiang

Jingeng Sha (coordinator) Group for the Regional Stratigraphic Chart of the Xinjiang Uygur Autonomous Region in 1981. The naming section is located at Ahe in the Kuqa County, Xinjiang. Lowermost formation in Kelasu Gr.

Synonym: （阿合组）, Arhe Fm (spelling).

Lithology and Thickness:

Ahe Formation consists of the coarse clastic rock layers composed essentially of grey-green pebbly sandstone, or the grey-white and grey sandstone and pebbly sandstone, intercalated with conglomerate. It is 300-500 m thick.

Lithology-pattern: Aus conglomerate

Relationships and Distribution:

Lower contact:

It is in a conformable contact with the underlying Tarichick Fm (Taliqik Fm; of Xiaoquangou Gr) of upper Triassic.

Upper contact:

It is in a conformable contact with the overlying Yangxia Fm of middle Jurassic.

Regional extent:

This formation is distributed largely in the areas of Kucha and Baicheng on the southern pediment of Tianshan Mts, with a good exposure of it being found in the areas of the Kucha River, Jeleweicheck River and Karasu River at Heiying Mts, as well as a sporadical exposure of it in the areas of Hantenggri Peak and Kapulong at Quexiang.

GeoJSON:

Fossils:

It yields abundant plant fossils, such as Czekanowskia rigida, Cladophlebis asiatica, Pityophyllum cf. nordenskioldi, Phenicopsis sp., Ginkgo huttoni.

Age:

Schematic strat column suggests early Jurassic (Hettangian-Sinemurian)

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:

The formation represents fluvial and deltaic deposits.

Depositional-pattern:

Additional Information

Compiler

Jingeng Sha (coordinator)