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

Kelvasay Formation

Kelvasay Fm

Period:

Carboniferous

Age Interval:

Bashkirian- Moscovian, N4a

Province:
Nuratau

Type Locality and Naming

Along the Kelvasay, N. Nuratau Ridge. P.N. Podkopaev et al., 1964f.

Synonym: Kelvasayskaya Suite, Кельвасайская св.

Lithology and Thickness

Gray and dark-gray limestones, often with a pinkish or brownish tint, flaggy, in some horizons nodular, fine-grained, aphinitic, polydetrital. Thickness about 60m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

With angular and azimuthal unconformity and a significant hiatus in sedimentation, it transgressively overlies various Paleozoic deposits (Podkopaev et al., 1964f.).

Upper contact

Along the overlying Mikhin Suite (460).

Regional extent

Northern Nuratau Ridge. Along F.R. Bensh, the upper part of the K. Suite of P.N. Podkopaev et al. (1964f.) corresponds to the Kelvasay Horizon. According to the data of M.N. Solovyova (424), the Kelvasay Fm is an age equivalent of the Koytash Fm. R.R. Usmanov et al. (1999f.) under this name distinguish the Kelvasay Series (Kelvasay Gr), including the Koytash Fm.

GeoJSON

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Fossils

Contains foraminifers - Endothyra bradyi Mikh., Pseudostaffella ex gr. antiqua (Dutk.), Staffellaeformis sp., Profusulinella rhomboides (Lee et Chen), Depratina ex gr. prisca (Depr.), Parastaffella propinqua Viss., P. ex gr. pseudosphaeroidea Dutk., etc.; tabulates - Chaetetes">Chaetetes ex gr. subcapillaris Sok., C. ex gr. namurensis Sok., etc.; brachiopods - Choristites priscus Eichw., C. deusicostatus Ivan., Dictyoclostus inflatiformis Ivan., determining the age of the enclosing rocks as Late Bashkirian-Early Moscovian of the Middle Carboniferous.

Age

On the State Geological Map-500 of Uzbekistan (460), the Kelvasay Fm is accepted only in the span of the Lower Moscovian Substage, Bashkirian formations are distinguished in the Koytash Fm. Put as Age equivalent of Koytash Fm" - "Late Bashkirian-Early Moscovian. [0.1-0.5]

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.1

Beginning date (Ma):

314.34

Ending stage:

Moscovian

Fraction up in the ending stage:

0.5

Ending date (Ma):

311.09

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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