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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Turkestan Formation

Turkestan Fm

Period:

Paleogene

Age Interval:

middle Eocene, S2, S3

Province:
North Tajik

Type Locality and Naming

Includes in Fergana Valley, Isfara River

Synonym: Turkestan layers

Lithology and Thickness

In Alai-Fergana basin, it is greenish-grey mudstones with grey and white siltstones, sandstones, marls and limestones, red mudstone intervals at the top, rich in oysters and other bivalves, 5-150 m.

Clays. Turkestan layers (15-100 m) are mainly composed of clays. The clays are gray and greenish-gray, predominantly carbonate. Among them, layers of marls, limestones, siltstones, and sandstones are occasionally noted. The number of layers and their thickness increase from the central and southwestern parts of Southwest Tajikistan to its periphery. The thickness of the described layers is 15-100 m.

Lithology Pattern:

Claystone

Relationships and Distribution

Lower contact

Overlies the Alai Fm

Upper contact

Overlain by the Rishan Fm.

Regional extent

Fergana Basin and Alai Valley Basin. Plus SW Tajikistan.

GeoJSON

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Fossils

Oysters and Bivalves. In the Turkestan layers, such forms as Fatina esterhazyi Pav., F. bohmi Vial., Liostrea kokanensis Sok., Chlamys vialovi Korob., Nuculana galeottiana Nyst, Crassatella desheysiana Nyst, Cultellus grignonensiformis Desh., Cardium porulosum Sol., Tellina doracialis Lam., Lucina consobrina Desh., Thracia bellardii Pict., Panope inteimedia Sow. are present.

Age

The age of the Bodrak stage is determined by most researchers as middle Eocene in recent times.

Age Span:

Beginning stage:

Bartonian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

41.03

Ending stage:

Bartonian

Fraction up in the ending stage:

0.5

Ending date (Ma):

39.37

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Bosboom, R., Mandic, O., Dupont‐Nivet, G., Proust, J. N., Ormukov, C., & Aminov, J. (2017). Late Eocene palaeogeography of the proto‐Paratethys Sea in Central Asia (NW China, southern Kyrgyzstan and SW Tajikistan). Geological Society, London, Special Publications, 427, 565–588. https://doi.org/10.1144/SP427.11.

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