Ahchakain Formation

Ahchakain Fm

Period:

Paleogene

Age Interval:

Upper Eocene (Priabonian), U2

Province:
Ustyurt-Sultanuzdag

Type Locality and Naming

Along the Ahchakaya estuary, North Turkmenistan. E.I. Saperzon, A.A. Zheleznov, 1962 (404, p.895).

Synonym: Akhchakain Suite, Ахчакаинская св.

Lithology and Thickness

Marls, clayey limestones light green, white, pink. Up to 40m.

Lithology Pattern:

Shallow-marine marl

Relationships and Distribution

Lower contact

Conformably overlies the Kurtysh Fm

Upper contact

Conformably or with a break overlain by the Daudan Fm, Kungarad Fm.

Regional extent

Pre-Aral, Ustyurt, Turukul-Khivinsky District. Correlated with the Maral Fm, Beloglyn Fm (Horizon) of the Caucasus. (444).

GeoJSON

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Fossils

Contains a complex of foraminifera from the Globigerapsis tropicalis Blow. et Bann. zone, Clavulinoides szaboi (Hantk.), Marginulina fragaria Gümb., M. böhmi (Reuss), Vaginulina mexicana Nutt., Globigerina corpulenta Subb., G. bulloides compacta Subb., Bulimina sculptilis Cushm., Uoigerina jacksonensis Cushm., Bolivina antegressa Subb.; marine bivalve mollusks Pycnodonta brongniarti queteleti Nyst., Cardita lukovichi Ruch., Tyasira vara Korob., T. rollei Mayer. et Gümb.; gastropods - Cassidaria formosa Alex., Bella sulcata Luk.

Age

Belongs to the upper Eocene (Priabonian cliff).

Age Span:

Beginning stage:

Priabonian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

37.71

Ending stage:

Priabonian

Fraction up in the ending stage:

1.0

Ending date (Ma):

33.90

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)”