Auval Formation

Auval Fm

Period:

Paleogene

Age Interval:

Middle Eocene (Lutetian), F9

Province:
Fergana

Type Locality and Naming

Near the village of Auval, South Fergana. U.M. Rasulov, G. Fathullaev, S.D. Morozov, 1991. Stratotype in the area of the village of Auval. The term is not used.

Synonym: Auval Suite, Аувальская св.

Reference section:

Lithology and Thickness

Limestones, shell limestones, sandstones, gypsum. Thickness 6-10m.

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

Conformably overlies the Chimion Fm

Upper contact

Conformably overlain by the Kyzylarchin Fm

Regional extent

South Fergana. Corresponds to the middle part of the Turkestan (Gulizindan) suite (Liostrea kokanensis layers) (160).

GeoJSON

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Fossils

Contains marine bivalve mollusks - Fatina bömi (Vial.), Liostrea kokanensis (Sok.); foraminifera - Nonion laevis Orb., Cribrononion ferganensis (N.Byk.); ostracods - Cytherilla evexa Mang., Biardia turkestanensis Mand., Pontocypris micans Mand., Cytheridea asiatica Mand., Trachyleberis bucera Mand., Hermanites suzakensis adrasmanensis Mand.

Age

Belongs to the Middle Eocene (Lutetian stage).

Age Span:

Beginning stage:

Lutetian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

44.55

Ending stage:

Lutetian

Fraction up in the ending stage:

1.0

Ending date (Ma):

41.03

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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