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

Novchomok Formation

Novchomok Fm

Period:

Carboniferous

Age Interval:

Tournaisian-Visean, Z1

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the Novchomok stream, Zarafshan Range. E.G. Fedorov et al. in 1988 (1991f.) from the composition of deposits previously attributed to the Upper Ordovician-Lower and Middle Devonian.

Synonym: Novchomok Suite, Новомокская св., Novomok Fm

Lithology and Thickness

Crinoid-detrital, detrital-nodular, clayey limestones with nodules of brown siliceous-carbonate material, lenses and interlayers of cherts, calcareous-clayey silicites, brown, reddish siliceous and calcareous claystone (argillites). At the base, sometimes basal limestone conglomerates. Thickness 45m.

Lithology Pattern:

Siliceous limestone

Relationships and Distribution

Lower contact

Conformably overlies, with a gradual transition, the Yatavlyuk Fm (Akbasy Fm)

Upper contact

Overlain transgressively with structural unconformity by the Darakhtisurkh Fm or Malguzor Fm.

Regional extent

GeoJSON

null

Fossils

In limestones, conodonts - *Siphonodella cf. sulcata* (Huddle), *Pseudopolygnathus primus* Bran. et Mehl., *Scaliognathus cf. anchoralis* Lanc. and others of the Tournaisian stage; *Palmatolepis gracilis gracilis* Brans. et Mehl., *Siphonodella cf. sulcata* (Huddle), *S. duplicata* (Brans. et Mehl.) and others of the Late Famennian-Tournaisian age; foraminifers - *Quasiendothyra* sp., *Konensis globiformis* Reitl., rugose corals *Keyserlingophyllum* sp. ind., *Caninia* sp. and others; tabulate corals - *Syringopora cf. ramulosa* Goldt. and others of Tournaisian-Visean age.

Age

Belongs to the Tournaisian and Visean stages of the Lower Carboniferous (Bukharin et al., 1996f.).

Age Span:

Beginning stage:

Tournaisian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

359.30

Ending stage:

Visean

Fraction up in the ending stage:

1.0

Ending date (Ma):

330.34

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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