Dzhalbakan Formation

Dzhalbakan Fm

Period:

Devonian

Age Interval:

Famennian, CK5a

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the Dzhalbakhan River, south-west slope of the Chatkalsky range. S.V. Litovchak, K.V. Seliverstov, et al., 1985.

Synonym: Dzhalbacan Suite, Джалбаканская св.

Lithology and Thickness

Limestones, often organogenic, partially "sugary" dolomites, sandstones are noted only at the base. Thickness from 100 to 350 m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

The lower boundary is conformable with the red-colored sandstones of the Airmin Fm of the Frasnian-Lower Famennian

Upper contact

The upper boundary is conformable, but possibly with a hidden stratigraphic break with the Sairam Fm

Regional extent

South and south-west slope of the Chatkalsky range.

GeoJSON

null

Fossils

Brachiopods - Camarotoechia turanica Rom., C. boloniensis Goss., Mesoplica praelonga (Som.), Cyrtospirifer aquilinus Rom., C. kickinensis Serg., Adolfia talassica (Vas.) etc., foraminifers Eovolutina elementa Antr., Parathurammina cushmani Sul., Septatournayella lebedevae Pojark., Bisphaera elongata Pojark. etc.

Age

The Famennian age is confirmed by brachiopods

Age Span:

Beginning stage:

Famennian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

371.10

Ending stage:

Famennian

Fraction up in the ending stage:

1.0

Ending date (Ma):

359.30

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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