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

Yakkhonin Beds Formation

Yakkhonin Beds Fm

Period:

Silurian

Age Interval:

Wenlock, Z1

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Named after the village of Yakkhona, basin of the Urech River, Zarafshan-Gissar mountain region. A.I. Lavrushevich, G.N. Menakova, 1966 (368, p.23). Stratotype in the section of Mount Daurch. Initially described as "J layers". Third member in the Shing Fm.

Synonym: Yakkakhonian Layers, Яккахонинские сл., Yakkhonin Beds; Yakkehonin Membere

Lithology and Thickness

Medium-bedded dolomitized limestones and dolomites. Thickness 25-70m.

Lithology Pattern:

Dolomite

Relationships and Distribution

Lower contact

Underlain by Hokgaltak (Khokgaltak Member)

Upper contact

Overlain by Nofin Member

Regional extent

Zarafshan-Gissar mountain region.

GeoJSON

null

Fossils

Contains stromatoporoids - Clathrodictyon">Clathrodictyon microtuberculatum Riab., C. microfastigiatum Riab.; corals - Multisolenia tortuosa Fritz, Favosites favosus Golf., Palaeocorolites nivalis Lel., Catenipora compressa Sok., Entelophyllum articulatum Wahl., Cystiphyllum Cylindricum Lonsd., Yassia fasciculata Lavr. et Ivanovsky, Ketophylloides atlassovi grandis Lavr.; brachiopods - Atrypina (?) frequens Men.

Age

Belong to the Wenlock stage of the Lower Silurian.

Age Span:

Beginning stage:

Sheinwoodian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

432.93

Ending stage:

Sheinwoodian

Fraction up in the ending stage:

0.5

Ending date (Ma):

431.78

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)”