Bukhara Formation

Bukhara Fm

Period:

Paleogene

Age Interval:

upper Paleocene (Thanetian), F2

Province:
Fergana

Type Locality and Naming

Stratotype in the area of the city of Isfara, Fergana. Along Bukhara Mountain. O.S. Vyalov, 1934 (151, p.45) in the rank of horizon with Cuneocorbula.

Synonym: Bukhara Suite, Bukhara horizon, Бухарская св.

Lithology and Thickness

Limestones, oolitic limestones, marls, calcareous and gypsiferous sandstones, gypsum layers. Thickness up to 300 m. In South Fergana, the lower part of these deposits is distinguished as the Sulyuktin Fm sandstones, the upper part (mountain " k ", Along K.P. Kalitsky (213)) - these are limestones with the Kaplanbek mollusk complex.

Lithology Pattern:

Oolitic limestone

Relationships and Distribution

Lower contact

Conformably overlies the Gyzylkum Fm or Akchagyl Gr, upper Bostagin subseries, with erosion on various upper Cretaceous mountains.

Upper contact

Conformably overlain by the Givar Fm, Suzak Fm, Sulyuktin Fm, or Kazakhtau Fm.

Regional extent

Very widespread -- Fergana Depression, Pre-Tashkent region, South-West Gissar, Bukhara Depression, Kyzylkum Desert, Zirabulak-Ziaetdin region. In North Fergana, the equivalent of Bukhara Fm is the Gavasay Gr (Abdusamatov et al., 1988f., 1991f.). It is correlated with the Tabakchin (layers with Lucina gravessi Desh.), Aruktausk, Karatag mountains of the Tajik Depression; with the Khodzhabulansky, Sorizorsky, Dagmynsinsky, and Zarminsky series of the Kopetdag (Turkmenistan). The upper part of the series in South-West Gissar (layers with Pycnodonta antiqua) is locally facially replaced by clays of the Givarskaya Gr

GeoJSON

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Fossils

Contains marine bivalve mollusks - Fimbria montensis Cossm., Corbula (Cuneocorbula) asiatica Vial., Crassatella bellovacina Desh., Cucullaea volgensis Barb., Arctica morrisi Sow., Ostrea bellovacina Lam., Lucina gravessi Desh., L. prevosti Desh., Cyrena forbesi Desh., etc., gastropods - Cerithium zeravschanensis Vial., Mathilda bimorpha Br. et Corn., Turritella montensis Br. et Corn.; large foraminifera - Nummulites fraasi de la Harpe., N. solitarius de la Harpe., N. deserti de la Harpe. In the lower part of the series (South Fergana, South-West Gissar), layers with Lucina gravessi Desh., L. prevost Desh., with Nummulites and sea urchins are distinguished. In the Fergana Depression and Bukhara Depression, in the top of the series, layers with Cyrena (Corbycula) forbesi Desh., in South-West Gissar - layers with Pycnodonta antiqua Schwet.

Age

Belongs to the upper Paleocene, Thanetian stage. [To avoid overlap with the overlying Sulyuktin Fm that also includes Thanetian, this is arbitrary assigned to the lower Thanetaian for graphic purposes.]

Age Span:

Beginning stage:

Thanetian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

59.24

Ending stage:

Thanetian

Fraction up in the ending stage:

0.5

Ending date (Ma):

57.62

Depositional setting

Depositional pattern:

Additional Information

Compiler:

A.A. Abdusamatov – In: GeoGPT translation of: ”Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)"