Karakatin Formation

Karakatin Fm

Period:

Cretaceous

Age Interval:

Campanian-Maastrichtian, K1-K9

Province:
Kyzylkum Region

Type Locality and Naming

In the Karakatin Basin, Central Kyzylkum, I.M. Abdazimova, 1988 (24, p.68). Stratotype described on the eastern slope of Dzhaman-Yarsai and in the Karakatin Basin.

Synonym: Karakatinskaya Suite, Каракатинская св.

Lithology and Thickness

Coastal marine formations. Divided into two sub-suites.

N. sub-suite - yellowish-green mottled sandstones, gravels with clay layers. Thickness 1-65m.

B. sub-suite - gray, greenish-gray sands, sandstones with layers of clays and light-gray limestones and shell rocks. Thickness up to 80 m.

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

The suite lies with erosion on the Laulau Fm in Kuldzhuktau, Auminzatau; on the Kynyr Fm in Tamdytau; on the Aytym-Cret Fm in Bukantau; on the Karasagyr Fm and on the Paleozoic in the Nuratau Mountains.

Upper contact

Schematic stratigraphic column indicates the upper contact as Kazakhstan Fm

Regional extent

Western and Central Kyzylkum, Nuratau Mountains; exposed on the plains by boreholes.

GeoJSON

null

Fossils

N. sub-suite - Contains marine bivalve mollusks - Liostrea lehmannii Rom., L. acutirostris Nils.; foraminifera - Haplophragmoides excavatus Cushm. et Water., H. rugosus Cushm. et Water., Ammobaculites jetemensis Tzatz.

B. sub-suite - Contains belemnites - Belemnella amudariensis Najd.; marine bivalve mollusks - Liostrea lehmannii Rom., Inoceramus barabini Mort., I. sarumensis Woods.; rudists; sea urchins - Domechinus vialovi Mosk.; bryozoans Dimorhocella voigti Favor.

Age

Belongs to the Campanian - Maastrichtian

Age Span:

Beginning stage:

Campanian

Fraction up in beginning stage:

0.15

Beginning date (Ma):

81.93

Ending stage:

Maastrichtian

Fraction up in the ending stage:

1.0

Ending date (Ma):

66.04

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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