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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Daraxtisurkh Formation

Daraxtisurkh Fm

Period:

Carboniferous

Age Interval:

Upper Moscovian (C2-3 m dr), C1, C1a, C1b, C1c

Province:
Central W Tajik

Type Locality and Naming

Includes in Hisar-Zarafshan ranges, and Obisafit, Turkparidin, Chakykalya typesections. It was distinguished in 1963 by M.N. Solovyova.

Synonym: Daraxtisurkhska Suite, Дарахтисурхская свита

Reference section:

Lithology and Thickness

It is represented by an alternation of gravels, polymictic sandstones, claystones, and layers of various conglomerates. The lower part is composed of conglomerates with subordinate sandstones and shales, the upper part is predominantly sandy-clayey. The incomplete suite power is 1000 m.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

It lies in places conformably, with a gradual transition (the Daraxtisurk and Karakul river basins), in places with a slight erosion (the Bachauldy, Zidda, Shingak river basins) on the late Bashkirian - early Moscowian Bachauldin Fm (бачаульдинской свите).

Upper contact

Regional extent

It is widespread in the Zarafshan-Gissar region in the Karakul-Ziddinskaya strip, in the Yagnobskaya strip.

GeoJSON

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Fossils

From the limestone pebbles of the conglomerates, numerous remains of algae, foraminifera, and corals of the early and middle coal age (early Moscow time) have been determined (Saltyovskaya, 1974). From the sandstone and shale layers, Fusulinella cf. communis Raus., Fusulina sp.; Spirifer (Choristites) ex gr. priscus Eichw., Calamites ex gr. suckowi Brong., have been determined, the age of which is not younger than the middle-late Carboniferous. In the clasts of the conglomerates, there are granitoids, which by petrographic and petrochemical properties are close to the granitoids of the middle-late coal-bearing Severovarzob complex, as well as various volcanic rocks.

Age

Upper Moscovian

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

309.46

Ending stage:

Moscovian

Fraction up in the ending stage:

1.0

Ending date (Ma):

307.02

Depositional setting

Depositional pattern:

Additional Information

It should be noted that at the base of the Daraxtisurkh Fm (дарахтисурхской Свиты) section, there lies a 50-meter layer of calcareous and clayey shales with sandstone layers (Saltyovskaya, 1974), above which is the conglomerate horizon. It is this horizon that some researchers accept as the base of the Daraxtisurkh Fm, and the contact is interpreted as transgressive (Cherenkov, 1973). The earlier representations (Kukhtikov, 1969) about the occurrence of the Daraxtisurkh Fm in places on the Visean limestones have not been confirmed. As it turned out in recent years, in none of the studied sections does the Daraxtisurkh Fm underlie deposits older than the lower Moscow substage. With the younger, in age, Luchob Fm (лучобской cвитой), conditionally referred to the lower Permian, the Daraxtisurkh Fm (дарахтисурхская свита) does not have stratigraphic contacts.

Compiler:

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