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

Kyzyltash Formation

Kyzyltash Fm

Period:

Cretaceous

Age Interval:

upper Hauteriviann - lower Barremian, B1-B3

Province:
Bukhara-SW Gissar

Type Locality and Naming

Along the Kyzyltash section, South-Western Gissar. N.P. Kheraskov, 1934 (487, p.19). Stratotype, probably in the Kyzyltash section. Upper formation in the Takchiyan Gr. Included in the Kyzyltash Horizon (55; 115; 133; 167; 274; 362; 363; 383; 415; 445; 498).

Synonym: Kyzyltash Formation, Кызылтатская св.

Lithology and Thickness

Reddish-brown clays, sandstones, siltstone (aleurolites) with layers of bluish-gray sandstones. In Central Gissar, sandstones, gravelites with rare layers of siltstone (aleurolites). Thickness 50-130m.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

Lies conformably on the Almurad Fm, with erosion on the Shirkent Fm

Upper contact

Conformably overlain by the Okuzbulak Gr.

Regional extent

South-Western, Southern, Central Gissar, Babatag ridge. Buhara-Karshinsky district borehole.

GeoJSON

null

Fossils

Contains freshwater bivalve mollusks - Trigonioides kodairaiformis Mart., Limnocyrena gissarica Mart.; ostracods - Malzevia ex gr. pellucida (And.), M. malzi Andrv., spores and pollen.

Age

Belongs to the upper Hauterivian - lower Barremian (362; 383), other data: in the Strat. lex. (446) - Hauterivian and beginning of Barremian; to the lower Barremian (452); to the lower Barremian and lower part of the upper Barremian (55).

Age Span:

Beginning stage:

Hauterivian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

129.55

Ending stage:

Barremian

Fraction up in the ending stage:

0.5

Ending date (Ma):

123.95

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)”