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

Aktyuzh Formation

Aktyuzh Fm

Period:

Ordovician

Age Interval:

Floian, N8

Province:
Nuratau

Type Locality and Naming

Along the Aktoyak River, Mount S. Nuratau. Deposits established by Z.M. Abdouazimova and O.N. Khaletskaya in 1958 (5 , p.9). Named by Yu.V. Shumakov and L.I. Skakun in 1982 (1984). Stratotype Along the Aktoyak River in tectonic scales and blocks.

Synonym: Aktoyak Suite, Актюжская св.

Lithology and Thickness

Mica slates, siltstone (aleurolites), layers of clayey limestones. Thickness 70-100m.

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

Tectonic contacts.

Upper contact

Tectonic contacts.

Regional extent

South Nuratau, northern slope of Karakchatay, basins of the Aktoyak and Mulla-Malya rivers. Analog of the lower part of the Badamchaly Fm (165; 371). R.S. Khan et al. (1989), V.S. Korsakov et al. (1993), R.R. Usmanov et al. (1999) include the Aktyuzh Fm in the composition of the Badamchaly Fm.

GeoJSON

null

Fossils

Contains graptolites of the Arenig - Expansograptus abnormis (Hsü), E. cf. hirundo (Hsü), E. suecicus robustus (Monz.), Acrograptus aff. affinis (Nich.); chitinozoa - Desmochitina ornensis Paris., D. minor Eis.; conodonts - Oistodus (?) sp. ind.; radiolarians.

Age

Age Span:

Beginning stage:

Floian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

477.08

Ending stage:

Floian

Fraction up in the ending stage:

1.0

Ending date (Ma):

471.26

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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