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

Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple

South Akbaytal Formation

South Akbaytal Fm

Period:

Neogene

Age Interval:

Serravallian (N₁?), E-Psh1

Province:
East Tajik (East Pamir)

Type Locality and Naming

Includes in East Pshart. It is distinguished in 1967 by V.I. Dronev, recently studied by I.A. Gusev (1972).

Synonym: South Akbaytal suite

Reference section:

Lithology and Thickness

In most cases consists of two horizons of volcanics, separated mainly by red-colored sandstones, gravelites, and conglomerates. The volcanics are mainly red-brown, less often gray and greenish-gray. By composition, among them, trachybasalts and mugearites, andesite-basalts, dolerites, essentially olivine basalts and dolerites are distinguished. Thickness of the lower horizon of volcanics is 20-100, the upper is 5-125 m, and the separating them red-colored layers are 50 - 100 m.

Lithology Pattern:

Volcanics

Relationships and Distribution

Lower contact

Conformably underlying on Yamantash Fm

Upper contact

Conformably overlying on Kyzylaygyn Fm

Regional extent

It is widespread in the Central Pamir in the basins of the Western and Eastern Pshart rivers, Buguchidzhilga, and others.

GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[73.59,38.21],[73.64,38.23],[73.7,38.23],[73.79,38.26],[73.87,38.28],[73.94,38.27],[74.07,38.25],[74.11,38.25],[74.2,38.23],[74.22,38.24],[74.29,38.23],[74.35,38.19],[74.33,38.19],[74.25,38.21],[74.03,38.2],[73.93,38.19],[73.83,38.18],[73.81,38.19],[73.77,38.18],[73.73,38.18],[73.72,38.19],[73.59,38.21]]]]}}

Fossils

Age

Considering these data and the similarity of the described species in color and largely in composition to the Buldzhuansky Fm of southwestern Tajikistan, the characterized species can be tentatively attributed to the Miocene. It is not excluded that they indeed correspond in age only to the Buldzhuansky suite and are lower Miocene. N. A. Gusev (1972) for the first time referred these species to the Miocene, previously they were considered Paleogene.

Age Span:

Beginning stage:

Serravallian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

13.82

Ending stage:

Serravallian

Fraction up in the ending stage:

1.0

Ending date (Ma):

11.63

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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