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

Kayrak-Perm Formation

Kayrak-Perm Fm

Period:

Permian

Age Interval:

Lower Permian (?), B1, B2

Province:
Bukhara-SW Gissar

Type Locality and Naming

By Mt. Kayrak, Baysuntay Mountains, Gissar Range. E.M. Golovin in 1942 (382, p. 85). “-Perm” qualifier added in the Lexicon name to distinguish it from the Kayrak (Kayrak-Ord Fm) in Chatkal-Kuramin region and in the Mogoltay mountains of Tajikistan.

Synonym: Kairakskaya Formation, Кайракская св.

Lithology and Thickness

Mainly volcanogenic rocks of effusive and explosive facies, represented by trachyandesibasalts, trachybasalts, basalts, trachyandesites, and their tuffs. In subordinate amounts, volcanomict sandstones, gravels, conglomerates. Up to 730 m.

Lithology Pattern:

Lava

Relationships and Distribution

Lower contact

Unconformably overlies the Gumatag Fm

Upper contact

Unconformably overlain by the Sandzhar Fm.

Regional extent

Gissar Range, south of the Baysuntay Mountains, small outcrops in the south of the Surkhan Mountains.

GeoJSON

null

Fossils

Age

Age is conditionally early Permian based on stratigraphic position. Along F.R. Bensh (102; 457), it is early-middle Carboniferous; Along D.A. Rubanov (385), the age of the K. suite is early Permian based on stratigraphic position and correlation with the volcanogenic complex of the lower Permian of the southern slope of the Gissar Range; in the Strat. Sl. (439), it is conditionally early Permian; according to O.N. Nikitina et al. (1993), the Kayrak-Perm Fm is late Permian; on the State Geol. Map-500 of Uzbekistan (460), it is conditionally referred to the lower Permian.

Age Span:

Beginning stage:

Artinskian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

290.51

Ending stage:

Kungurian

Fraction up in the ending stage:

1.0

Ending date (Ma):

274.37

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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