Tokhumbet Formation

Tokhumbet Fm

Period:

Cretaceous

Age Interval:

Turonian - Coniacian, K10

Province:
Kyzylkum Region

Type Locality and Naming

Along the Toxumbet Depression, Nuratau Mountains. I.M. Abdazimova, 1998 (165, p.146) used the name proposed by G.V. Taraborin (1963) for the Toxumbet Mountains. Stratotype - Along wells drilled in the Toxumbet Depression. Coastal-marine formations.

Synonym: Toxumbetskaya Suite, Тохумбетская св.

Lithology and Thickness

Upper part - gray, variegated clays, siltstone (aleurolites) with layers of sandstones and sandy coquina.

Lower part - red, yellow, cross-bedded sandstones, sands, gravelites, conglomerates

Thickness 37-68m.

Lithology Pattern:

Coarse-grained sandstone

Relationships and Distribution

Lower contact

Lies transgressively on the Paleozoic and with erosion on the Kendyktyube Fm

Upper contact

It is overlain with erosion by the Karasagyr Fm.

Regional extent

Southwestern end of the South Nuratau Range (foothills of the Aktau, Karatau, Kokcha Mountains, Chettyk village area, etc.)

GeoJSON

null

Fossils

The suite contains marine bivalve mollusks - Inoceramus ex gr. apicalis Woods., Megatrigonia syrdariensis Arkh., M. turkestanensis Arkh., foraminifers Ammomarginulina aulatensis Arap., A. sixtelae Arap., Gaudryinella pseudoasiatica N. Byk., Pseudoclavulina kasarinovi Arap. et Suleim.

Age

Belongs to the upper Turonian - Coniacian. Used in the legend of the Kyzylkum-Nurata series for geological maps of the 1:200000 scale.

Age Span:

Beginning stage:

Turonian

Fraction up in beginning stage:

0.85

Beginning date (Ma):

90.07

Ending stage:

Coniacian

Fraction up in the ending stage:

1.0

Ending date (Ma):

85.70

Depositional setting

Coastal-marine

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)”