Yangxia Fm

Xinjiang

Jingeng Sha (coordinator) Group for the Regional Stratigraphic Chart of the Xinjiang Uygur Autonomous Region in 1981. The naming section is located to the north of the Yangisar area of the Tulgeming region, Lutai County (ca. 41.8N, 84.2E), Xinjiang. Middle formation in Kelasu Gr.

Synonym: （阳霞组）, Yangisar Fm

Lithology and Thickness:

The formation is composed of grey-white and yellow-grey gritstones, grey-green siltstones, grey-black shales, carbonaceous mudstones and coal beds, with a thickness of about 200-400 m. Its basal part consists of sandstones with fluvial cross-beddings.

Lithology-pattern: Sandstone

Relationships and Distribution:

Lower contact:

It is in a conformable contact with the underlying Arhe Fm (= Ahe Fm)

Upper contact:

It is in a conformable contact with the overlying Kyzylnur Fm (= Kezilenur Fm)

Regional extent:

The particular formation is distributed in the Kuche-Baicheng area with an unitary lithology and a less changeable thickness. Better exposures of the particular formation are found in the Yangisar area of the Tulgeming region, Luntai County, Bositeng-Gancao Lake, Hantenggri Peak, Kapusilang and Kalasu River areas.

GeoJSON:

Fossils:

It yields plant fossils such as Neocalamites carcinoides, N. carrerei, Ciniopteris hymenophylloides, Cladophlebis denticulate, Phoenicopsis cf. angustifolia, Podozamites lanceolatus, Taeniopteris sp., Pityophyllum nordenskioldi, Baiera longifolia and Ginkgoites sp., as well as bivalve fossils as represented by Ferganoconcha sibirica.

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)