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

Suzak Formation

Suzak Fm

Period:

Paleogene

Age Interval:

early Eocene, S2, S3

Province:
North Tajik

Type Locality and Naming

Includes in Fergana Valley, Isfara River

Synonym: Suzak strata

Lithology and Thickness

In Alai-Fergana basin, it is "complex colored (calcareous) mudstones, siltstones and sandstones; 5 to 120 m." (Bosboom et al., 2017)

Sandstones, marls, limestones. Suzak strata in the Dushanbe, Kafirnigan, and Vakhsh regions are represented by clays with rare low-power interlayers of siltstone, sandstones, marls, limestones, combustible shales, and nodular phosphorites. In the northern and eastern directions, the number of sandstone interlayers noticeably increases, and in the Zaalaik and Darvaz regions, they occupy a dominant position. The thickness of the Suzak strata is 1-120 m.

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

In Alai-Fergana basin, it overlies the Bukhara-Fergana Fm.

Elsewhere, it lies on the Karatag horizon deposits of the Bukhara strata. In the areas of Tau, Salduz, Payragatau, and Southwest Darvaz, the omission of a part of the upper Paleocene from the stratigraphic sequence is observed, which may indicate the transgressive deposition of the Suzak beds on underlying sediments.

Upper contact

Alai Fm

Regional extent

Fergana Basin and Alai Valley Basin

Dushanbe, Kafirnigan, Vakhsh, Zaalay districts, Qaramazar district, South Fergana district, Zeravshan-Gissar district, Karategin district, Darvaz district

GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[68.81,39.88],[69.03,39.9],[69.45,39.98],[71.41,41.03],[71.78,41.31],[73.02,40.87],[71.84,39.88],[70.94,39.83],[70.1,39.66],[68.92,39.51],[68.44,39.58],[68.41,39.72],[68.54,39.89],[68.81,39.88]]]]}}

Fossils

Bivalves. The faunal complex encountered in the Suzak beds is distinguished by great diversity. Here, there are mollusks (Korobkov, Kreydenkov, Romanovich, 1973) Ostrea hemiglobosa Rom., Gryphaea camelus Burac., Nemocardium vateleti Desh., Nucula submargaritacea Roud., Vermetus spirolaevis Lam., Turritella interposita Desh., Turricula pyrenaicensis (Cossm.); large foraminifers (Barhatova, Davidzon, 1966) Nummulites bolcensis Munier - Chalmos, N. praemursohisoni Nem. et Barkhat., Discocyclina archiaci (Schlumb); small foraminifers (Bykova, 1953; Morozova et al. 1965) Globorotalia subbotinae Moroz., G. ex gr. crassata Cushm., etc.

Age

The listed faunal complexes indicate the early Eocene age of the Suzak beds

Age Span:

Beginning stage:

Ypresian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

56.00

Ending stage:

Ypresian

Fraction up in the ending stage:

1.0

Ending date (Ma):

48.07

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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

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.