Bosagin Formation

Bosagin Fm

Period:

Cretaceous, Paleogene

Age Interval:

Upper Cretaceous-Lower Paleocene, K10

Province:
Kyzylkum Region

Type Locality and Naming

Along the Bosaga section, East Kyzylkumy V.A. Bykadorov, S.M. Bljakhova, O.A. Fedorenko, 1967 (124, p.79).

Synonym: Bosaginskaya Suite, Босагинская св.

Lithology and Thickness

Upper sub-suite: anhydrites and dolomites, dolomitized marls.

Lower sub-suite: red-colored clays, marls, siltstone (aleurolites) with gravel. Thickness up to 25m.

Lithology Pattern:

Gypsum-Anhydrite

Relationships and Distribution

Lower contact

Upper sub-suite lies conformably on the lower sub-suite. Lower sub-suite lies conformably on Upper Cretaceous deposits.

Upper contact

Upper sub-suite is conformably overlain by the Kaplanbek Fm (in Tashkent district set) or with erosion by various Paleogene formations. Lower sub-suite is conformably overlain by the upper sub-suite.

Regional extent

Eastern. Kyzylkumy, foothills of Karatau (Syr-Darya Depression).

GeoJSON

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Fossils

Upper sub-suite contains spore-pollen - *Kizylkumina oenotheraformis* Bljachova; marine bivalve mollusks - *Corbula angulata* Desh., *C. biangulata* Lam. and others.

Lower sub-suite contains pollen - *Extratriporollenites rostratus* Bljachova, *E. menneri* (Bolch.), *Sporopollis penaserta* Pfl.; dinosaur eggshells, charophyte algae.

Age

Upper sub-suite belongs to the Lower Paleocene (Danian-Montian stage). Lower sub-suite belongs to the Upper Cretaceous.

Age Span:

Beginning stage:

Maastrichtian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

69.11

Ending stage:

Selandian

Fraction up in the ending stage:

1.0

Ending date (Ma):

59.24

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)”