Khodzhaosman Formation

Khodzhaosman Fm

Period:

Cretaceous

Age Interval:

Barremian- Aptian, F3, F9e, F9f

Province:
Fergana

Type Locality and Naming

NE Fergana, Naucat Basin, well. Along the Khodgeosman oil field, Fergana. N.A. Dudko, A.M. Khutorov in 1957 (417, p.59). Lowermost formation in Changet Gr.

Synonym: Khodzhaosman Suite, Ходжаосманская св.

Lithology and Thickness

Dark red clays with layers of greenish-gray siltstone (aleurolites), sandstones, gravelites, and limestones, with ripple marks, cross-bedding, and traces of mud eaters. Thickness 15-377m.

Lithology Pattern:

Siltstone

Relationships and Distribution

Lower contact

Overlies transgressively on the Paleozoic or Hodzhabad Fm

Upper contact

Conformably overlain in NE Fergana by the Alamyshik Fm, in E Fergana by the Klaudzin Fm or Aryan Fm

Regional extent

NE Fergana, Naucat Basin, well. It is the second from the bottom suite of the Changet Gr. In the foothills of Fergana, it corresponds to the Kokyar Fm (446). I.M. Abdurazimov

GeoJSON

null

Fossils

Contains freshwater bivalve mollusks - Trigonioides kodairaiformis Mart., ostracods - Cypridea admiranda Gal., C. simplex Gal., C. bispinosa Gal., C, koskulensis Mand.

Age

Belongs to the upper Barremian - lower Aptian; Along A.V. Sochava (434), - to the Barremian - Aptian; Along N.N. Verzilin (140), - to the Albian; Along the Decision, 1977 (383), - to the Gotherian - lower Aptian; in (452) and (55) - to the Barremian - Aptian.

Age Span:

Beginning stage:

Barremian

Fraction up in beginning stage:

0.75

Beginning date (Ma):

122.68

Ending stage:

Aptian

Fraction up in the ending stage:

0.4

Ending date (Ma):

118.12

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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