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

Pyazyn Formation

Pyazyn Fm

Period:

Silurian

Age Interval:

Ludlow-Prídolí, Z5

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the Pyazyn ridge, central part of the Zirabulak-Ziaetdin mountains. V.S. Korsakov et al. in 1960 (1962) (166, p. 120; 460, p. 87). Stratotype on Mount Piya, upper reaches of Tymsay.

Synonym: Pyazyn Suite, Пьязынская св., Pyazin Fm

Lithology and Thickness

Dolomites, dolomitic limestones with interlayers and lenses of limestones. Thickness 650-700m.

Lithology Pattern:

Dolomite

Relationships and Distribution

Lower contact

It lies with a gradual transition on the Terikbabin Fm

Upper contact

The upper contact is conformable with the Dzhalkyr-Aymakhal Fm.

Regional extent

Zirabulak-Ziaetdin Mountains, Mahmudtau Mountains, eastern continuation of g, Boir; rural district of Altyaul, south of the Ayrabel Mountains.

GeoJSON

null

Fossils

Contains late Silurian tabulates - Favosites stepanovi Kov., F. cf. forbesi M.Edw. et Haim., Parastriatopora ex gr. tebenjkovi Tchern. and others; stromatoporoids - Amphipora cf. antiqua Grin. and others (Korsakov et al., 1962; Barkovskaya et al., 1965, 1967).

Age

According to the data of V.S. Korsakov, the Ludlow-Pridoli age is established by organic remains and conformable overlap by faunally characterized Lower Devonian deposits. V.S. Korsakov et al. (1993), (166) and in the monograph (165) date the sv. as late Silurian; Str. sl. (443)

Age Span:

Beginning stage:

Gorstian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

426.74

Ending stage:

Pridoli

Fraction up in the ending stage:

1.0

Ending date (Ma):

419.00

Depositional setting

Depositional pattern:

Additional Information

Compiler:

V.S. Korsakov, 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)”