Nanay Gr

Period:

Quaternary

Age Interval:

Neopleistocene (Chibanian), CK11

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the village of Nanai, the left bank of the Pskem River, Prishchekent district. Yu.A. Skvortsov, 1953 (419a, p.14). At the Central Asian and South Kazakhstan conferences, it was identified as the lower Quaternary section. X.A. Toychiev, based on paleomagnetic data, identified that the terrace deposits were formed during the period of normal polarity - Brunhes, i.e., in the early Quaternary (Safarov et al., 1999); conglomerates - in the early Neopleistocene, and loess-soil formations - in the late Pleistocene-Holocene.

Synonym: Nanai Complex, Nanai Gr, Нанайская компл.

Lithology and Thickness

In the highlands, glacial deposits of the Kishlaksay moraine are attributed; boulder conglomerates of the upper part of the Turasay Fm; boulder debris with gravel and pebbles of alluvial-proluvial genesis. In the foothills and on the plain - alluvial deposits of terraces, proluvial cones of outwash, subaerial deposits of the upper part of the Karamazar Fm and the lower part of the Zarkent Fm, travertine-like - strongly carbonatized loesses of the Karamazar Fm. Five soil horizons from gray to reddish-brown color have been identified in the loesses. Thickness from the first to 918m (in the Fergana depression).

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

In the Pre-Tashkent district, it lies with erosion on the Neogene.

Upper contact

It is usually overlain by loams.

Regional extent

Pre-Tashkent district, Fergana depression, Malguzar and Nurata mountains, Kashkadarya region. Corresponds to the Sokh Fm of Fergana, the Kulob Fm of southern Uzbekistan. (128; 458).

GeoJSON

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Fossils

Contains bone remains of Carvus elaphus, Cazella sp., and others, contained in the deposits of the Karamazar suite. Ostracods have been identified only in the plain part and contain Darvinula sp., Stenocypris aff. alata, Cyclocypris leevis, Candona rostrata, C. ex gr. convexa, C. ex gr. nuredagensis, C. (Candona) suzina, C. (C.) alloicans, C. (C.) ex gr. balchanensis, C. (C.) pellucida, Schnciderlla sp., Herpetocypris sp., Ilyocypris Gibba, I. bradyi, I. tuberculata, and others.

Age

The age of the N. complex as lower Neopleistocene is established on the basis of paleomagnetic data (the paleomagnetic boundary Brunhes-Matuyama - 0.73 million years passes at the boundary of the Kumyshkan Fm and Zarkent Fm). According to A.A. Bukharina, the above mentioned ostracods are characteristic of the early Quaternary deposits of the Baku horizon. Pollen of Chenopodiaceae and oogonia of charophyte algae have also been identified in the deposits of the complex.

Age Span:

Beginning stage:

Chibanian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

0.32

Ending stage:

Chibanian

Fraction up in the ending stage:

1.0

Ending date (Ma):

0.13

Depositional setting

Depositional pattern:

Additional Information

Compiler:

X.A. Toychiev, M.V. Mikulin – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”