Itelguin Formation

Itelguin Fm

Period:

Carboniferous

Age Interval:

Upper Visean, CK5

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the Itelehiuya Ridge. A.Ya. Gladchenko in 1955 in the Moldotau Ridge (439, p. 161). Stratotype on the southern slope of the Itelgiuia ridge.

Synonym: Itelghiuinskaya Suite, Ительгуинская св.

Lithology and Thickness

Organogenic-detrital limestones, locally dolomitized, with interlayers of claystones, siltstone (aleurolites), and chert lenses. Thickness 150-400 m.

Lithology Pattern:

Dolomitic limestone

Relationships and Distribution

Lower contact

It conformably overlies the Kibray-Carb Fm

Upper contact

It conformably underlies the Aksuy Fm

Regional extent

Ugam-Kumbelesky and Chatkalsky districts; Karzhantau, Tekeli, Chatkalsky, Ugam, Pskem, Sandalash ridges.

GeoJSON

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Fossils

Brachiopods - Moderatoproductus sarsimbaii (Serg.), Striatifera spinifera (Paeck.) and others; foraminifers - Forshia mikhailovi Dain., Endothyranopsis compressus (Raus. et Reitl.), Pojarkovella nibelis (Dutk.); conodonts - Gnathodus bilineatus (Roun.), G. girtyi Hass. and others.

Age

Visean age is determined by stratigraphic position and a complex of organic remains. Previously, the suite was considered middle Visean (166; 457). Currently, with a two-member division of the Visean, it is late Visean (460). Along I.M. Nigmadzhanov (1992), at this stratigraphic level, the Ispayevskaya suite is distinguished, which includes a similar fauna but differs from the I. suite in lithological composition.

Age Span:

Beginning stage:

Visean

Fraction up in beginning stage:

0.6

Beginning date (Ma):

336.90

Ending stage:

Visean

Fraction up in the ending stage:

0.7

Ending date (Ma):

335.26

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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