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

Yakarchin Formation

Yakarchin Fm

Period:

Carboniferous

Age Interval:

Visean, Z2

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the Yakarche River, north slope of the Gissar Range. V.D. Saltovskaya, 1969 (403, p. 44). Stratotype along the Yarkarche River.

Synonym: Yakarchinskaya Suite, Якарчинская св.

Lithology and Thickness

At the base, sandstones, conglomerates, shales, above - dark carbonaceous limestones. Thickness 150m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Lies sharply unconformably on Middle Devonian limestones

Upper contact

Conformably overlain by the Sangalt Fm (Bezuglov et al., 1985). (439; 460).

Regional extent

Northern slope of the Gissar Range, in the form of separate strips.

GeoJSON

null

Fossils

Contains brachiopods - Gigantoproductus sarsimbai Serg., G. mirus Freks.; corals - Lithostrotion junceum Flem., L. irregulare Fill., foraminifers - Monotaxis Gibba (Moell.), Mediocris cf. ovalis Viss., Planoarchaediscus Spirillinoides (Raus.), Eostaffella proikensis Raus., Forschia mikhailovi Dain., characteristic of Visean deposits.

Age

Age Span:

Beginning stage:

Visean

Fraction up in beginning stage:

0.0

Beginning date (Ma):

346.73

Ending stage:

Visean

Fraction up in the ending stage:

0.5

Ending date (Ma):

338.54

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)”