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

Bolosay Formation

Bolosay Fm

Period:

Devonian, Carboniferous

Age Interval:

Famennian-Tournaisian, N4

Province:
Nuratau

Type Locality and Naming

Along Bolosay, N. Nuratau range. R.S. Khan in 1993 (485, p.10) from the composition of the Eastern Daristan suite.

Synonym: Bolosay Suite, Болосаиская св.

Lithology and Thickness

Siltstone (aleurolites), claystone (argillites), sandstones with layers of platy cherts, limestones, basalts, and their tuffs. Thickness 170 m.

Lithology Pattern:

Siltstone

Relationships and Distribution

Lower contact

Contacts with underlying and overlying deposits are tectonic.

Upper contact

Contacts with underlying and overlying deposits are tectonic.

Regional extent

Northern Nuratau range, Mikhin-Daristan structure (syncline) - upper part of the third tectonic cover.

GeoJSON

null

Fossils

In cherts, conodonts - Palmatolepis gracilis sigmoidalis Ziegl., P. gracilis gracilis Br. et Mehl., Polygnathus glabra Ul. et Bas., Bactrognathus cf. hamatus Br. et Mehl., Gnathodus sp., characterizing Famennian and Tournaisian deposits.

Age

Based on paleontological data, the age of the Bolosay Fm is dated as Late Devonian (Famennian stage) and Early Carboniferous (Tournaisian stage).Put as Base Pragian for graphic purposes (because overlain by Asmansay Fm, which is accepted as Lower Devonian) - "Famennian-Tournaisian

Age Span:

Beginning stage:

Pragian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

412.40

Ending stage:

Pragian

Fraction up in the ending stage:

1.0

Ending date (Ma):

410.51

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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