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

Ust-Kuruksay Formation

Ust-Kuruksay Fm

Period:

Devonian

Age Interval:

Frasnian, N3

Province:
Nuratau

Type Locality and Naming

Along the Say Ust-Kuruk, Khanbandytay Mountains, northern foothills of the N. Nuratau Range. P.N. Podkopaev et al. in 1961 (166, p. 195). Stratotype in Ust-Kuruksay.

Synonym: Ust'kuruksay Fm, Устькуруксайская св.

Lithology and Thickness

Foliated, platy, and thin to medium-bedded organogenic limestones with inclusions and interbeds of claystone (argillites), siltstone (aleurolites), and siliceous rocks. Thickness 190-450m.

Lithology Pattern:

Reef limestone

Relationships and Distribution

Lower contact

Conformably overlies the Mentian Fm

Upper contact

Contact with the overlying Predgorno-Nuratin Fm is tectonic.

Regional extent

Northern foothills of the N. Nuratau Range, Khanbandytay Mountains

GeoJSON

null

Fossils

Contains brachiopods - Theodossia cf. anossofi Vern., Adolfia Bifida Roem., Atrypa uralica Nal.; conodonts - Ancyrognathus triangularis Young., Palmatolepis hassi Mull., P. foliacea Young., Ancyrodella gigas Young

Age

Fossil data indicates a late Frasnian age. Belongs to the upper Frasnian. (165; 388,460).

Age Span:

Beginning stage:

Frasnian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

375.00

Ending stage:

Frasnian

Fraction up in the ending stage:

1.0

Ending date (Ma):

371.10

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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