Kalaatin Formation

Kalaatin Fm

Period:

Cretaceous

Age Interval:

Lower Cretaceous (upper Aptian), K7, K9

Province:
Kyzylkum Region

Type Locality and Naming

Named after the village of Kalaata, Central Kyzylkum. I.M. Abdurazimova, E.M. Shvets, 1987 (27, p.55). Stratotype 3 km southwest of the village of Kalaata at the western end of the Kuldjuktau Mountains.

Synonym: Kalaatin Suite, Калаатинская св., Kalayta (in McCann), Kalaat Formation

Lithology and Thickness

Marine dark and greenish-gray clays with interlayers of sandstones. Thickness 20-60m.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

Overlies transgressively on the Paleozoic and Tuzkoy Fm

Upper contact

Overlain with erosion by the Dzhamanyar Fm (Jamanyar suite).

Regional extent

Central Kyzylkum, foothills of the Kuldjuktau and Auminzatau, on plains, exposed by drilling. Analog of the Middle Asian Fm sub-suite of the Zirabulak-Ziaetdin Mountains and the Lower Charshangin Fm sub-suite (of the south of the Gissar Range) (25; 28).

GeoJSON

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Fossils

Contains ammonites - Hypacanthoplites ex gr. jacobi Col.; marine bivalve mollusks - Nucula pectinata sultanuisica Vinok., Amphidonte arduennensis zeravschanica (Muzaph.), Linotrigonia gissarensis Vinok., Pterotrigonia aliformis Park.; foraminifers - Evolutinella formosa (Suleim.), Trochammina dampelae Dain, Verneuilina vinokurovae Zhuk., Gaudryinella albica Aleks.; spores and pollen, % - Appendicisporites matesovae (Bolch.) Norris (0-1), Clavifera foveolata Shv. (0-2), C. triplex Bolch. (0-2), Gleicheniidites senonicus Ross. (8-52), G. carinatus Bolch. (0-7), Inaperturopollenites Dubius (Pot. et Venitz) Th. et Pf. (4-80) and others.

Age

Assigned to the upper Aptian, N. jasovi zone.

Age Span:

Beginning stage:

Aptian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

115.66

Ending stage:

Aptian

Fraction up in the ending stage:

0.9

Ending date (Ma):

114.02

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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