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

Garibak Formation

Garibak Fm

Period:

Silurian

Age Interval:

Llandovery-Pridoli, Z3

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the village Garibak, Chumkartau Mountains. A.I. Minakov in 1963 (460, p.90). Stratotype in the area of the village Garibak.

Synonym: Garibakian Suite, Гарибаксская св.

Lithology and Thickness

Carbonaceous-clayey slates, siltstone (aleurolites) with layers of limestones, calcarenites, marls, sandstones, and siliceous slates. To the east, basalt, trachybasalt, and andesite bodies are noted (Shadchinen, 1970). Thickness 150-500 m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

Lies conformably on the Padask suite

Upper contact

Unconformably overlain by the conglomerates of the Roch Fm (165; 460).

Regional extent

Southwestern part of the Chumkartau Mountains, valley of the Zarafshan River.

GeoJSON

null

Fossils

In the slates, graptolites of Wenlock - Cyrtograptus murchisoni (Carr.), Monograptus riccortonensis Lapw., M. flexilis Elles, etc., Ludlow and Pridoli Neodiversograptus nilssoni (Lapw.), Lobograptus scanicus (Tullb.), Tamplograptus formosus (Bouč.), Saetograptus leintwardinensis (Hopk.), etc. (Starshinin et al., 1994).

Age

Lower Silurian Llandovery stage - Upper Silurian Pridoli stage.

Age Span:

Beginning stage:

Sheinwoodian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

432.93

Ending stage:

Pridoli

Fraction up in the ending stage:

0.25

Ending date (Ma):

421.80

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)”