Andygen Gr

Period:

Carboniferous

Age Interval:

Lower–Middle Carboniferous (Serpukhovian–Moscovian), F10b

Province:
Fergana

Type Locality and Naming

In the Andygenta Mountains, Turkestan Range. V. I. Kotel'nikov in 1974 (459, p. 280).

Synonym: Andygen Series, Андыгенская сер.

Lithology and Thickness

Limestones with lenses of cherts, bauxites, allites, conglomerate-breccias. Thickness 400-850m. It unites the deposits of the Gaz Fm and Kauzan Fm (443;460).

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Along the stratigraphic position, it lies on the Peshkaut Fm, with erosion or in a continuous section

Upper contact

It is overlain by the Tolubay Fm

Regional extent

Turkestan and northern foothills of the Alai Range, South Fergana; most fully represented in Kyrgyzstan.

GeoJSON

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Fossils

Characterized by Serpukhovian foraminifers - *Asteroarchaediscus micus* Pojark., brachiopods - *Productus concinnus* Sow., *Marginifera schartimiensis* (Jan.), Lower Moscovian foraminifers - *Aljutovella aljutovica* (Raus.), *Profusulinella convoluta* Lee et Chen., Moscovian brachiopods - *Choristites priscus* (Eichw.), *C. ex gr. mosquensis* (Fisch.).

Age

Age Span:

Beginning stage:

Serpukhovian

Fraction up in beginning stage:

0.1

Beginning date (Ma):

329.65

Ending stage:

Moscovian

Fraction up in the ending stage:

0.1

Ending date (Ma):

314.34

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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