Chalmin Formation

Chalmin Fm

Period:

Cretaceous

Age Interval:

Lower Cretaceous (?), F6

Province:
Fergana

Type Locality and Naming

Along the Chalma elevation, S.-E. Fergana. A.V. Sochava, G.G. Martinson, 1963 (288, p.1148). Stratotype in the lower reaches of the Tar River. Lowermost (sixth) formation in Changet Gr

Synonym: Chalmin Suite, Чалминская св.

Lithology and Thickness

Dark conglomerates or breccias with interlayers of gravelites and sandstones. In the northeastern Fergana - pink sandstones with cross-bedding. Thickness 70-220m.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

Conformably overlies the Oytalin Fm (Kyrgyzstan) or unconformably overlies the Paleozoic

Upper contact

Conformably overlain by the Kokyar Fm

Regional extent

The foothills of the Fergana Range. Corresponds to the Hodzhiaabad suite of S.N. Simakov (417) or the middle Hodzhiaabad sub-suite of N.N. Verzilina (141). Along A.A., the Ch suite is an analogue of the upper part of the Karabil suite and is assigned to the upper Jurassic (433; 434). A.V. Sochava. Str. sl. (446). I.M. Abdouazimova

GeoJSON

null

Fossils

Age

Conditionally assigned to the lower Cretaceous.

Age Span:

Beginning stage:

Berriasian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

143.10

Ending stage:

Valanginian

Fraction up in the ending stage:

1.0

Ending date (Ma):

132.60

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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