Tashkent Gr

Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Main source = Baratov, R.B., et al. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Publishing House "Donish", Dushanbe, 269 pp. plus tables. Provided by Dr. Jovid Aminov, Nazarbayev University, Astana, Kazakhstan Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

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Tashkent Gr

Period:

Quaternary

Age Interval:

Middle Quaternary (Qi), S2, S3

Province:
North Tajik

Type Locality and Naming

Includes in Fergana Valley, Isfara River

Synonym: Tashkent complex, Ташкентский комплекс

Reference section:

Lithology and Thickness

Loose gravelly-cobble and sandy-silt deposits. It is represented by proluvial, alluvial, alluvial-proluvial, and deluvial-proluvial formations. Proluvial and deluvio-proluvial deposits are widely distributed in the southern foothills of the Kuramin ridge and the northern foothills of the Turkestan ridge. They consist of loose gravelly-cobble and sandy-silt deposits, rarely - tightly cemented cobbles, up to 30-50 m thick. These are the deposits of second-generation erosion cones (the first is Lower Quaternary), forming a significant part of the fore-mountain apron and embedded in the formations of the Sohsky (Nanai) complex. Toward the center of the Fergana Basin, they submerge beneath the younger deposits. In the Digmai-Supetauskaya Ridge, they form "ski jump-like" terraces. Alluvial and alluvio-proluvial deposits are represented by gravels, gravels, sands, and loess-like silt of the IV and V supra-bank terraces with a thickness of 30-100 m, less often - gray loose stratified conglomerates with interlayers of gravelites lying with a slight angular unconformity on the conglomerates of the Sohsky (Nanai) complex. As a rule, the lower part of the terraces is composed of gravels, the upper part - of loess-like silt.

Lithology Pattern:

Aus conglomerate

Relationships and Distribution

Lower contact

Sohsky Gr (slight angular unconformity on the conglomerates of the Sohsky (Nanai) complex)

Upper contact

Toward the center of the Fergana Basin, they submerge beneath the younger deposits.

Regional extent

The Syr Darya river in the Karamazar, South Ferghana districts and in the northern part of the Turkestan district. Coeval with the deposits of the Tashkent complex with the Ilyak Middle Quaternary complex of Southwest Tajikistan.

GeoJSON

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Fossils

Middle Paleolithic and Mousterian tools

Age

The Middle Quaternary age of the Tashkent complex deposits is conditionally determined by their position relative to the Sohsky (Nanai) complex (overlying or embedded), as well as by findings in the Shahristan area (Nesmeianov, Ranov, 1962) of Middle Paleolithic and Mousterian tools and by correlating the deposits of the Tashkent complex with the Ilyak Middle Quaternary complex of Southwest Tajikistan.

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:

1.0

Ending date (Ma):

0.13

Depositional setting

Proluvial, alluvial, alluvial-proluvial, and deluvial-proluvial

Depositional pattern:

Additional Information

Compiler:

Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Dushanbe, 276.