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

Obizard Formation

Obizard Fm

Period:

Carboniferous

Age Interval:

Middle-upper Carboniferous, Z3

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the village of Obizard, Turkestan Range. V. D. Saltovskaya in 1966 (403, p. 47). Stratotype on the left bank of the Madm River, 1.5-2 km upstream from the village of Madm.

Synonym: Obizard Suite, Обизардская св.

Lithology and Thickness

Lower part - rhythmically alternating gravels, sandstones, and slates (flysch); middle - polymictic conglomerates with boulders and olistoliths (up to 1000 m) of carbonate, terrigenous, siliceous, less frequently volcanic and intrusive rocks. Upper part - rhythmic alternation of sandstones and clay slates. Thickness 250-800m.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

Transgressively overlies the limestones of the Urmitan Fm (Chumkartau Mountain)

Upper contact

Overlying deposits not established.

Regional extent

Turkestan Range, Zarafshan Valley.

GeoJSON

null

Fossils

In limestone pebbles, boulders, and blocks, algae, foraminifera, corals, brachiopods from the Silurian to the Visean stage of the early Carboniferous (402). In the cement of conglomerates and sandstones, algae Ungdarella uralica Masl., Beresella sp., foraminifera - Profusulinella sp.

Age

Age - based on fauna and proximity to deposits developed in adjacent areas - is accepted as late Moscovian - conditionally late Carboniferous. (379; 460).

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

311.09

Ending stage:

Moscovian

Fraction up in the ending stage:

1.0

Ending date (Ma):

307.02

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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