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

Mukhak Beds Formation

Mukhak Beds Fm

Period:

Silurian

Age Interval:

Upper Llandovery, Z1

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the Muhkak, basin of the Shing River, Zarafshan-Gissar mountain region, C. Tajikistan. A.I. Lavrushevich, G.N. Menakova, 1966 (368, p.21). Stratotype in the section of Mt. Daurech. Fifth member in the Shing Fm.

Synonym: Muhkaksi Layers, Мухакские сл.

Lithology and Thickness

Thin-bedded or nodular black clayey dolomitized detrital limestones, sometimes with admixture of aleurolitic and sandy material. Thickness 32-45m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

Along the bedding, they lie on the Daurich Beds Fm

Upper contact

They are conformably overlain by the Hokgaltak Beds (Khokgaltak Beds Fm).

Regional extent

Zarafshan-Gissar mountain region.

GeoJSON

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Fossils

Contain stromatoporoids - Clathrodictyon">Clathrodictyon microstriatellum Riab., C. convictum Yavor.; tabulates - Thecia (Hemithecia) insolens Lel., Palaeofavosites aff. hirtus Sok., Favosites gothlandicus Lam., F. hisingeri M.E. et H., F. regularis Jones, Catenipora compressa (Sok.); rugosans - Entelophyllum articulatum Wahl., Cystiphyllum Cylindricum Lonsd., C. densum Hill.; brachiopods, crinoids.

Age

By age, they correspond to the Late Llandovery

Age Span:

Beginning stage:

Telychian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

438.59

Ending stage:

Telychian

Fraction up in the ending stage:

0.5

Ending date (Ma):

435.76

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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