Sohsky 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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Sohsky Gr

Period:

Quaternary

Age Interval:

Early Quaternary (Qi), S2, S3

Province:
North Tajik

Type Locality and Naming

Includes in Fergana Valley, Isfara River

Synonym: Sohsky complex, Сохский компле1кс, Sokh complex, Nanai complex

Reference section:

Lithology and Thickness

Conglomerates. In the South Ferghana region and in the north of the Turkistan region in the foothills of the Ferghana basin, the Sohsky (Nanai) complex is represented by dislocated deposits of alluvial cones: rubble and boulder unsorted brown and gray rocks up to 100-200 m thick. As they move away from the mountain ridges, they are replaced by alluvial and alluvial-proluvial loose gravels, gravels, sands, and loams with interlayers of rubble, gravel, and individual fragments. In the Digmai-Supetauskaya ridge, the Sohsky complex is formed by interbedded conglomerates and conglomerate breccias, gravelly-sandy rocks, polygrain sandstones with interlayers of claystones up to 10 to 300-400 m thick. In the central part of the Ferghana basin, the thickness of the Sohsky complex, exposed by reference wells, reaches 1500 m.

Lithology Pattern:

Aus conglomerate

Relationships and Distribution

Lower contact

The lower age boundary of the Sohsky Gr is determined by its unconformity on layers containing the Ili (late Pliocene) faunal Gr.

Upper contact

It is overlain by deposits of the middle Quaternary Tashkent Gr (Geol. USSR, vol. 23, 1972; Chedia, 1971). In the Penjikentskaya depression, alluvial conglomerates with lenses and interlayers of dense loams are conditionally referred to the Sohsky (Nanai) Gr. They are overlain by strongly compacted loams of loess-like appearance ("shoh"). In Uzbekistan, their thickness according to geophysical data is 800 m (Geol. USSR, vol. 23, 1972). They lie unconformably on Pliocene conglomerates and sandstones.

Regional extent

It is widely distributed in the South Fergana region and in the northern part of the Turkestan region. Its analogs are conditionally distinguished in the South, in the western part of the Turkistan region in the Penjikentskaya depression and in the southwest of the Zarafshan-Gissar region in the Magianskaya depression.

GeoJSON

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Fossils

Age

Their Early Quaternary age is conditionally determined based on correlation with coeval deposits in the Bukhara and Kyzylkum regions (Geol. USSR, vol. 23, 1972).

Age Span:

Beginning stage:

Calabrian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

1.80

Ending stage:

Calabrian

Fraction up in the ending stage:

1.0

Ending date (Ma):

0.77

Depositional setting

Alluvial cones, alluvial and alluvial-proluvial

Depositional pattern:

Additional Information

Compiler:

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