Keltemashat Formation

Keltemashat Fm

Period:

Carboniferous

Age Interval:

Serpukhovian, CK3-5, CK6

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the Kelytemashat River, Koykebiltay Mountain, western part of the Talas Alatau ridge, O.I. Sergun'kova, 1959 (382, p. 64). Stratotype on the southern slope of Koykebiltay Mountain, right bank of the upper reaches of the Kelytemashat River. Upper formation in Ugam Gr

Synonym: Keltemahashat Suite, Keltmashatskaya suite, Кельтемашатская св.

Lithology and Thickness

Limestones are layered, predominantly medium-layered, organogenic, organogenic-detrital, detrital-slime, locally oolitic, with the presence of siliceous nodules. Characteristic feature - the presence of numerous shell layers consisting of thin-walled brachiopod shells. Thickness 160-260m up to 300 m.

Lithology Pattern:

Oolitic limestone

Relationships and Distribution

Lower contact

Lies conformably on the Mashat Fm

Upper contact

It is conformably overlain by the Koykebiltau Fm (Talas Alatau ridge), Nauvalin Fm (Ugam, Pskem ridge) or Dzhegirgen Fm (Karjantau, northern slope of the Chatkal ridge) suite (Tkachev et al., 1992ф.; 1996ф.; 439; 460).

Regional extent

Throughout the Chatkal region.

GeoJSON

null

Fossils

Contains brachiopods - Striatifera angusta Jan., S. striata Fisch.; foraminifera - Eostaffella protvae (Raus.), Eosigmoilina minima Br., Globivalvulina moderata Reitl.; conodonts - Gnathodus bilineatus bollandensis Hig., Lochriea cruciformis (Clarke)

Age

Fossils are characteristic of the Serpukhovian stage.

Age Span:

Beginning stage:

Serpukhovian

Fraction up in beginning stage:

0.1

Beginning date (Ma):

329.65

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