Neogene

Paleogene

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Mesoproterozoic

Paleoproterozoic

Main source = Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian) Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

Kuruk Formation

Kuruk Fm

Period:

Cretaceous

Age Interval:

Santonian, B2

Province:
Bukhara-SW Gissar

Type Locality and Naming

Named after the village of Kuruk, South Gissar. A.Ya. Frolenkova, Yu.S. Yurtaev, A.Kh. Chanyshev, 1966 (479, pp. 300–301). Stratotype near the village of Kuruk. The Kuruk Formation belongs to the Katkamysh Horizon (56; 446; 452).

Synonym: Kurukskaya Formation, Курукская св.

Lithology and Thickness

Composed of gray and dark-green clays and sandstones, and light-gray sandy limestones with rudists. Thickness 28–95 m.

Lithology Pattern:

Shallow-marine marl

Relationships and Distribution

Lower contact

Conformably overlies the Nilya Fm (South Gissar) or Gezan Fm (of Zarafshan district)

Upper contact

It is conformably overlain by the Akbulak-Cret Fm (South Gissar) or Khushikat Fm (of Zarafshan district).

Regional extent

South Gissar, Babatag Range, Zeravshan District.

GeoJSON

null

Fossils

Contains ammonites – Stantonoceras sp.; marine bivalves – Exogyra decussata Goldf., Megatrigonia syrdariensis (Arkh.), Anomia cryptostriata surkhandariensis Bobk.; foraminifers – Ammobaculites flabellamminaformis N. Byk., Gaudryinella pseudoasiatica N. Byk.

Age

The Kuruk Formation is assigned to the Santonian and belongs to the Katkamysh Horizon (56; 446; 452).

Age Span:

Beginning stage:

Santonian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

85.70

Ending stage:

Santonian

Fraction up in the ending stage:

0.5

Ending date (Ma):

84.68

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)”