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

Uchkolsay Formation

Uchkolsay Fm

Period:

Neogene

Age Interval:

Upper Pliocene, B1

Province:
Bukhara-SW Gissar

Type Locality and Naming

Named after Uchkolsay, southwestern Gissar. G.Yu. Alferov et al., 1969.

Synonym: Uchkolsay Suite, Учколсайская св.

Lithology and Thickness

Lacustrine-alluvial brownish and brownish-gray clays and siltstone (aleurolites) with subordinate sandstones. Thickness 120m.

Lithology Pattern:

Claystone

Relationships and Distribution

Lower contact

With erosion, it lies on the Kyzylchin Fm and Paleogene

Upper contact

conformably overlain by the Khozhalchin Fm

Regional extent

Southwestern Gissar, Beshkent Depression. The clay-silt (aleurolite) rocks of the Uchkolsay Fm form the lower part of the Tandyrchin Fm, from the composition of which they were distinguished as an independent.

GeoJSON

null

Fossils

Contains ostracods - Potamocypris lunaris Schn., P. sp., Cyclocypris sp., Limnocythere depressa Schn., L. cinctura Mand., L. muschketovi Bod., L. ex gr. longuaris Bod., Eucypris koktalensis Bod.

Age

The stratigraphic name, A.A. attributed it to the middle-late Miocene (61). According to B.I. Pinhasov (144), upper Pliocene. In the depressions of southwestern Gissar and Kyzylkum, similar silty-clayey (aleurolite-argillaceous) rocks form the lower part of the Dengizkul Fm.

Age Span:

Beginning stage:

Piacenzian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

3.60

Ending stage:

Piacenzian

Fraction up in the ending stage:

0.5

Ending date (Ma):

3.09

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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