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

Urtabulak Formation

Urtabulak Fm

Period:

Jurassic

Age Interval:

Middle - Upper Jurassic, B1a

Province:
Bukhara-SW Gissar

Type Locality and Naming

Along the Urtabulak mine, Bukhara-Karshinsky district. Kh.Kh. Mirkamalov, P.U. Akhmedov, S.T. Khusanov, G.S. Abdullaev, 1979 (299, p.28). Uppermost formation in Kugitang Gr in Southwest Gissar (barrier reef region for Late Jurassic)

Synonym: Urtabulak Suite, Уртабулкасская св.

Lithology and Thickness

Massive light biomorphic coral-algal, organogenic-detrital limestones of the rudite and calcarenite type. Predominantly light color, biomorphicity, high cavernosity, porosity, and permeability. Thickness 100-200m.

Lithology Pattern:

Reef limestone

Relationships and Distribution

Lower contact

Schematic stratigraphic column indicates the lower contact as Mubarek Fm

Upper contact

Schematic stratigraphic column indicates the upper contact as Gaurdak Gr

Regional extent

Boreholes. The suite corresponds to the XV reef horizon.

GeoJSON

null

Fossils

Contains corals - Microsolena fromenteli Koby, Calamophylliopsis kyrvakarensis (Babaev.) et al. (205), confirming the reef origin of the U. suite.

Age

Its age, according to A.A., is determined by the complex of corals as late Oxfordian - early Kimmeridgian. Reef complexes of the suite in the Southwestern Gissar and Bukhara-Karshinsky district are of different ages (462, fig.1) from late Callovian to middle Oxfordian and it is not recommended to distinguish such t. in independent suites (440).

Age Span:

Beginning stage:

Oxfordian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

156.81

Ending stage:

Kimmeridgian

Fraction up in the ending stage:

0.3

Ending date (Ma):

153.12

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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