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

Dzhadyr Formation

Dzhadyr Fm

Period:

Ordovician

Age Interval:

Middle-Upper Ordovician (Caradocian-Ashgillian), N1

Province:
Nuratau

Type Locality and Naming

Along the Dzhadyr spring, N. Nuratau ridge. V.S. Korsakov et al. (1993f.) in the volume of the Ordovician.

Synonym: Dzhadyrskaya Suite, Джадырская св.

Lithology and Thickness

Rhythmically alternating oligomictic and polymictic sandstones, siltstone (aleurolites), clay-slate slates. Signs of underwater currents, unevenness of the sea floor. Thickness 300-400 m.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

Lower contact – unclear

Upper contact

Upper contact is stratigraphically unconformable with the Tulebay Fm

Regional extent

Southwestern end of the N. Nuratau ridge, northeastern part of the Shokhetau structure. Previously, these deposits were attributed (Pyatkov et al., 1975f., Bukharin et al., 1982f., Usmanov et al., 1984f.) to the upper part of the Besapan Fm ("green Besapan"). Analogue of the Murun Fm in Tamdytau.

GeoJSON

null

Fossils

Contains Ordovician chitinozoa - Lagenochitina baltica Tis., Cyathochitina vaurealensis Achab. and others.

Age

Age Span:

Beginning stage:

Sandbian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

458.18

Ending stage:

Katian

Fraction up in the ending stage:

1.0

Ending date (Ma):

445.21

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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