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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Bukhara Formation

Bukhara Fm

Period:

Paleogene

Age Interval:

Lower-Upper Paleocene (P₁), C2, C2a

Province:
Central W Tajik

Type Locality and Naming

Includes in Dushanbe-west Shirkent-Luchob, east Shirkent-Luchob

Synonym: Bukhara layers, Бухарские слои

Reference section:

Lithology and Thickness

They are represented by carbonate or gypsum-carbonate sediments. In the Kafirnigan, Vakhsh, Zaalay districts, as well as in some points of the Dushanbe district (Dashlibed), they are divided into three horizons. The lower, Tabakchinsky horizon (табакчинский roризонт) is formed by limestones and dolomites. The middle, Aaruktausky (аруктауский), consists of two packages: the lower one, carbonate-clay, and the upper one, sulfate-carbonate or sulfate. The upper, Karatag horizon (каратагский) is composed of clayey limestones. In most of the Dushanbe district, the Bukhara layers are dichotomous. The lower Tabakchinsky horizon (табакчинский горизонт) is clearly distinguished, formed by limestones and dolomites with interlayers of gypsum, and the two upper horizons are composed of a single thickness of clayey limestones and marls. In the Kafirnigan, Vakhsh, and Zaalay districts, the thickness of the Bukhara layers is 50 - 230 m. In the Dushanbe district, the thickness of the Bukhara layers is 70-100 m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

In the Kafirnigan, Vakhsh, and Zaalay districts, they lie conformably on the Adjarian Fm. In the Dushanbe district, It lies here transgressively on the lower package of the Adjarian Fm. If the Bukhara strata (basins of the Karatag and Lyuchob rivers) are found at the lower level (settlements of Khochilir, Dashitbed, etc., with a base layer of limestone breccia),

Upper contact

Regional extent

It is distributed in the Kafirnigan, Vakhsh, Zaalay districts, as well as in some points of the Dushanbe district (Dashlibed).

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Fossils

The Bukhara strata contain numerous and diverse remnants of fauna (Morozova, Kreidengkov, Davidszon, 1965; Kreidengkov, Ashurov, 1971).

For the Tabakchinsky horizon, the presence of Laevicardium trifidum Desh., Cardita excellens Harb., Lucina montensis Cossm., Pitar montensis Cossm., Calyptraea suessoniensis Orb., Turritella mariaea Br. et Corn., Pleurotomaria tadjikistanica Mironova, Rostellaria morceouxi Desh., Nummulites fraasi Harpe, N. solitarius Harpe, N. deserti Harpe is characteristic.

In the Aruktausk horizon, Crassatella bellovacensis Desh., Cuculaea volgensis Barb., Cyprina morrisi Sow., C. lunulata Desh., Nummulites fraasi Harpe, Spiroplectammina manischensis Moroz. et Kuril., Anomalia krimensis Moroz., Clobigerina trivialis Subb., G. pseudobulloides Plumm are found.

In the Karatag horizon, Gryphaea antiqua Schwetz., Liostrea reussi Netsch., Lucina microdonta Desh., Cyprina lunulata Desh., Pholadomya cuneata Sow., P. konincki Nyst, Dosiniopsis orbicularis Desh., Nemocardium edwardsi Desh. and numerous foraminifera of the "Acarinina tadjikistanensis" zone (Bikova, 1953) have been found.

Age

Based on the above-listed faunal complexes, one can confidently assign the Bukhara strata to the Paleocene. Moreover, the Tabakchinsky horizon can be attributed to the lower-upper Paleocene (Inkerman-Kachinsky stages of the Soviet scheme or Montane-Tanet stages of the Western European scheme), while the Aruktausk and Karatag horizons - to the upper Paleocene (Kakhinsky or Tanet stages).

Age Span:

Beginning stage:

Danian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

62.98

Ending stage:

Thanetian

Fraction up in the ending stage:

1.0

Ending date (Ma):

56.00

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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