Subashin Formation

Subashin Fm

Period:

Paleogene

Age Interval:

Middle Eocene (Bartonian), F2

Province:
Fergana

Type Locality and Naming

Named after the native Subashi, SE Fergana. G.Kh. Salibaev, 1989f. (Decision of the Commission on the Paleogene System of Central Asia RMSK, 1989). Stratotype near native Subashi. Corresponds to the lower part of the Rishtan Fm, layers with Ostrea simplex.

Synonym: Subashinskaya Suite, Субашинская св.

Lithology and Thickness

Marls, sandstones, limestones. Thickness up to 8 m. Known as the IY oil-bearing bed.

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

Lies conformably on the Turkestan Gr

Upper contact

It is conformably overlain by the Nefteabad Fm

Regional extent

Southeast Fergana.

GeoJSON

null

Fossils

Contains numerous oysters - Liostrea simplex (Desh.); marine bivalve mollusks - Nucula kasakstanica Ruch., Clycymeris aralensis (Rom.), Liostrea simplex (Desh.), L. rischtanica Vial., Chlamys vialovi Korobk., Lucina saxorum Lam., L. consobrina (Desh.), Nemocardium edwardsi (Desh.), Pitar gumberensis (Arch.); pollen - Polypodiaceae, Cyathea, Picca sp., Pinus sp., Haploxylon, Takodiaceae, Ephedra sp., E. eocenica Shaxhm., Myrica vera Saner, Juglans sp., Alnus sp., Quercus gracilis Boitz.; foraminifera - Nonion laeve (Orb.), Elghidium rischtanicum Byk., Cibicides vialovi Byk., Discorbis ferganensis N. Byk.

Age

Belongs to the middle Eocene (Bartonian stage).

Age Span:

Beginning stage:

Bartonian

Fraction up in beginning stage:

0.1

Beginning date (Ma):

40.70

Ending stage:

Bartonian

Fraction up in the ending stage:

0.5

Ending date (Ma):

39.37

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)"