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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Kuruksay Formation

Kuruksay Fm

Period:

Neogene

Age Interval:

Upper Pliocene, K1, S5

Province:
SW Tajik, North Tajik

Type Locality and Naming

Includes in Khation Region, Sughd Region. (Lskutov et al., 1971) were distinguished in the Kulab district on a small territory between the villages of Bol'dzhu'an and Khovaling in the basin of the Tira, Kuruksay, and Obimazar rivers. Upper Fm in Kulyab Gr

Synonym: Kuruksay Suite, Куруксайская свиты

Reference section:

Lithology and Thickness

Conglomerates. The lower Kuruksay suite is predominantly composed of conglomerates with a thickness of 330 m. Their total thickness is 430 m.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

According to V. V. Loskutov et al. (1971), the Kuruksay Fm is deposited at an angular unconformity on the Boljjuan Fm, Khingaus Fm, and Tavnl'darin Fm; O. K. Chediya (1971) considers the contacts of the Kuruksay Fm with older deposits to be of tectonic origin.

Upper contact

Locally overlain by the Kayruba Fm; or the Kuruksay Fm is overlain at an angular unconformity by Middle Pleistocene and younger formations.

Regional extent

The stratigraphic relationships between the Kulab, Kuruksay, and Kayrubakska suites have not been reliably established and are understood differently. V. A. Vasilyev (1966) and O. K. Chediya (1971) consider the Kuruksay suite as Upper Pliocene, not part of the Kulab complex. They relate the Kulab and Kayrubakska suites to it, apparently regarding them as age equivalents (the name "Kayrubakska" is not used by them). The Kulab complex is understood by E. A. Vasilyev and O. K. Chediya as Lower Pleistocene based on the determinations of A. M. Babayev's collections at Obi-Garma, and also determinations of the remains of Lower Pleistocene flora collected by M. M. Pakhomov near the village of Lahuti in the valley of the Obimazar River (Chediya, 1971). V. V. Loskutov et al. (1971) consider the Kuruksay and Kayrubakska suites as age equivalents of a single Kulab suite; they distinguish the Kulab complex, consisting of the two aforementioned suites.

The problems of stratigraphic relationships between the three suites characterized, the clarification of their actual distribution in individual regions, and thus the age of the Karanak and Polizak suites (see Fergana Basin) require further research.

GeoJSON

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Fossils

In the horizons of loess-like clays in the upper part of the Kuruksay Fm, remains of the Upper Pliocene Equus stenonis Cocchi, Equus cf. stenonis Cocchi, similar to those collected near Ordzhonikidzeabad, have been found. Faunal remains have not been found in the Kayrubakska suite.

Age

Piacenzian

Age Span:

Beginning stage:

Piacenzian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

3.60

Ending stage:

Piacenzian

Fraction up in the ending stage:

0.5

Ending date (Ma):

3.09

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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