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

Raz Beds Formation

Raz Beds Fm

Period:

Silurian

Age Interval:

Middle Llandovery, Z1

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the Raz River, Shing River basin, Central Tajikistan. A.I. Lavrushevich, G.N. Menakova, 1966 (368, p. 19). Stratotype in the section of the Daurich Mountain

Synonym: Raz Skiy Layers, Разские сл., Raz Beds; Raz Layers

Lithology and Thickness

A thick (up to 200 m) sequence of greenish-brown quartz–chlorite–sericite shales, gradually overlain by a sequence (up to 30 m) largely consisting of quartz sandstones of variable grain size, gravels, and conglomerates.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

The relationship with the underlying rocks is unclear.

Upper contact

Overlain by the Bilfurak Beds Fm (Biolfurak Member).

Regional extent

Zarafshan-Gissar mountain region.

GeoJSON

null

Fossils

In the upper part – Palaeofavosites cf. schmidti Sok., R. balticus Rukh. Tabulate corals are found in some parts of the sequence.

Age

Assigned to the Upper Llandovery. Initially (265) they were described as "S layers" by A.I. Lavrushevich. Strat. sl. (441).

Age Span:

Beginning stage:

Rhuddanian

Fraction up in beginning stage:

0.2

Beginning date (Ma):

442.56

Ending stage:

Rhuddanian

Fraction up in the ending stage:

1.0

Ending date (Ma):

440.49

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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