Mashat Formation

Mashat Fm

Period:

Carboniferous

Age Interval:

upper Visean-lower Serpukhovian, CK3-5, CK6

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the Mashat River, Daunatau Mountain, western part of the Talassky Alatau Ridge. O.I. Sergun'kova, 1959 (382, pp. 60-61) in the volume of the mountains. Stratotype on the right bank of the Masha River, in the area of confluence with the Koturbulak River. Middle formation in the Ugam Gr

Synonym: Mashatskaya Suite, Машатская св.

Lithology and Thickness

Thick-bedded and massive limestones, organogenic-detrital, oolitic with frequent interlayers of shell rocks consisting of large thick-walled shells of gigantoproductids. Thickness 130-350m. Along some researchers, in the upper reaches of the Chatkal River (460) Thickness 500-700m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Conformably overlies the Ispay Fm, Aksuy Fm (only in Chatkal Range)

Upper contact

Conformably overlain by the Keltemashat Fm (439;457; 460).

Regional extent

Western part of the Talas Alatau, Ugam, Pskem, Sandalash, and Chatkal ranges.

GeoJSON

null

Fossils

Contains brachiopods - Gigantoproductus giganteus Mart., G. rectestrius Grob., G. latissimus Sow.; foraminifers - Howchinia Gibba (Moell.), Endothyranopsis crassus (Brady), Neoarchaediscus parvus (Raus.)

Age

Fossil data determines the age within the late Visean-Serpukhovian.

Age Span:

Beginning stage:

Visean

Fraction up in beginning stage:

0.8

Beginning date (Ma):

333.62

Ending stage:

Serpukhovian

Fraction up in the ending stage:

0.1

Ending date (Ma):

329.65

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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