Tashkent Gr

Period:

Quaternary

Age Interval:

Neopleistocene middle link, CK11

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the Prityashkentsky district. N.P.Vasilykovsky, Yu.A.Skvortsov, 1935 (128, p.17).

Synonym: Tashkentsky Complex, Ташкентский компл.

Lithology and Thickness

This complex includes deposits of the Aksham moraine (Aksham Fm) in the high mountains, alluvial and alluvial-proluvial deposits of the V and IV floodplain terraces in the medium mountains, foothills, and plains, deposits associated with them in the form of alluvial fans, proluvial foothill fan tails, and subaerial deposits of the lower part of the Zarafshan Beds Fm. Thickness 5-30 and up to 200-270m (in depressions). On the plain and in the foothills, where a two-member division is visible, it can be subdivided into the Lower and Upper Tashkent subcomplexes.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

Depending on the genesis, it may have various (conformable, unconformable, leaning) contacts with the underlying rocks.

Upper contact

Regional extent

Prishashkent District, Fergana Depression, Malguzar Mountains, Nurata Mountains, Kashkadarya Region. N.P. Kostenko (467) correlates it with the Ilyak complex (Ilyak Fm) of Southern Tajikistan.

GeoJSON

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Fossils

Contains tools from the Middle Paleolithic. For the Lower Tashkent subcomplex, characteristic ostracods include Ilyocypris Gibba (Ramd.), I. bradyi Sars., Candona (Candonae) albicans (Brady), C. (C.) suzini Schn., C. (C.) sp., Limnocythere aff. pomosa Mand., Schneiderella sp., Lincocypris sp., Darwinula sp., Eucypris sp., and others. In the Upper Tashkent subcomplex, Ilyocypris bradyi Sars., Candona angulata Müll., C. (Candonae) suzini Schn., Eucypris pomosa Schn., E. sp., Limnocythere sp., and others have been found; spores and pollen of trees, shrubs, and grasses; spores of lower fungi; remains of green algae, insects.

Age

N.P. Vasilkovsky and Yu.A. Skvortsov (128) attributed the Tashkent complex to the Middle Quaternary period.

Age Span:

Beginning stage:

Chibanian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

0.77

Ending stage:

Chibanian

Fraction up in the ending stage:

0.5

Ending date (Ma):

0.45

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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)”