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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Tashkalyak Formation

Tashkalyak Fm

Period:

Neogene

Age Interval:

Messinian (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: Tashkalyak suite

Reference section:

Lithology and Thickness

It consists of red-colored, large-gravel at the bottom, and medium- and small-gravel dense conglomerates with layers and lenses of various-grained polymictic sandstones and gravelites. Thickness 400-500 m.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

Conformably underlying on Kyzylaygyn Fm

Upper contact

older than the Quaternary, are unknown

Regional extent

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

GeoJSON

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Fossils

In the described Fm, spores and pollen have been found, close to those from the lower Miocene? Boljuon Fm (больджуанской ~виты) of Southwestern Tajikistan: herbaceous xerophytic Chenopodiaceae, Compositae, Artemisia, Plumboginaceae; woody angiosperms Betula, Ulmus,Elaters, Platanus, Fraxinus, Liquidambar, Salix; gymnosperm and coniferous trees such as Pinus cf. longifolia, P. cf. gerardiana, P. cf. exelsa, P. cf. minitus, etc. (Gusev et al., 1972).

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:

Messinian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

7.25

Ending stage:

Messinian

Fraction up in the ending stage:

1.0

Ending date (Ma):

5.34

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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