Ugam Gr

Period:

Carboniferous

Age Interval:

Late Visean - Serpukhovian, CK3-5, CK6

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the Ugam River, Chatkal Range. M.A. Avakov et al., 1959 (382, p. 65) as a suite. For some time, the name was not used because the U. suite was mistakenly considered a synonym of the Keltemashat Fm.

Synonym: Ugam Series, Угамская сер.

Lithology and Thickness

Light "clean", massive and thick-bedded limestones, predominantly organogenic-detrital and oolitic. Thickness 500-100 m. The Ugam Gr includes the Ispay Fm, Mashat Fm, and Keltemashat Fm

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

The lower boundary of the suite with the underlying Pskem Fm is conformable, very clear. It is marked by the appearance of thick-bedded limestones without flint, locally dolomitized.

Upper contact

The upper boundary is also conformable with the Dzhegirgen Fm

Regional extent

W. and S.-W. parts of the Talas Alatau, Chatkal, Pskem, Ugam, Sandalash, Koksuy ranges. Laterally, sometimes the U. suite is replaced by the Paltaus Fm (upper reaches of the Mazar-Sai).

GeoJSON

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Fossils

Contains representatives of the brachiopod genera Moderatoproductus, Gigantoproductus, Striatifera; foraminifers - Eostaffella, Omphalotis, Globivalvulina; conodonts - Gnathodus, Lochriea.

Age

The full age range is determined in the interval from the lower part of the late Visean to the boundary between the early and middle Carboniferous. M.A. Avakov et al. in 1959 considered the U. suite to be of late Visean age (382; 457).

Age Span:

Beginning stage:

Visean

Fraction up in beginning stage:

0.6

Beginning date (Ma):

336.90

Ending stage:

Serpukhovian

Fraction up in the ending stage:

0.5

Ending date (Ma):

326.87

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)”