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

Sartbulak Formation

Sartbulak Fm

Period:

Silurian

Age Interval:

Lower Silurian, N8

Province:
Nuratau

Type Locality and Naming

Along the Sartbulak River, South Nuratau Ridge. Yu.I. Loshkin, N.A. Mazanenko, 1969 (271, pp.41-43), in the volume of the lower part of the Llandovery. The term is no longer in use.

Synonym: Sartbulak Suite, Сартбулакская св.

Lithology and Thickness

Rhythmic interbedding of feldspar-quartz fine-grained sandstones and siltstone (aleurolites), layers of clayey and carbonaceous-clayey slates are encountered. Thickness 100-110m.

Lithology Pattern:

Sandstone

Relationships and Distribution

Lower contact

The relationship with the underlying Hatching Fm, apparently, is normal

Upper contact

With the overlying ones is not established.

Regional extent

South Nuratau Ridge, Karatau Mountains, Karakchatay, Aktay.

GeoJSON

null

Fossils

In the upper part of the section (left bank of the Tusun River near the Karakia settlement, right bank of the Aktapa River) in variegated siltstone (aleurolites), Lower Llandovery graptolites are found - Spirograptus proteus (Barr.), Streptograptusex gr. runcinatus (Lapw.), Monograptus corneolus Chal., M. colbiensis Rued. and others.

Age

Different researchers understood the apan and age of this suite differently. Yu.I. Loshkin et al. (271) determined Thickness 650-750m and considered it conformably overlain by the Lower Buratbulak suite; Yu.V. Shumakov et al. (1973) and I.A. Pyanova et al. (1984; 371) dated it within the lower-middle Llandovery. According to the data of R.S. Khan et al. (1989) and R.R. Usmanov et al. (Korsakov et al., 1993), the suite (in the understanding of Yu.I. Loshkin) includes deposits of different ages of the Nakrut Fm, Dzhabulak Fm, and Badamchaly Fm. In the Strat. vol. (443) it corresponds to the lower part of the Llandovery.

Age Span:

Beginning stage:

Aeronian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

440.49

Ending stage:

Aeronian

Fraction up in the ending stage:

0.5

Ending date (Ma):

439.54

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)”