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

Akmulin Formation

Akmulin Fm

Period:

Ordovician

Age Interval:

Middle Ordovician, N5

Province:
Nuratau

Type Locality and Naming

Named after the village of Akmulla, Malguzar Mountains. A.N. Golikov in 1984 (1988), (460, p.61).

Synonym: Akmullinskaya Suite, Акмулинская св.

Lithology and Thickness

Siltstone (aleurolites), interbedded with polymictic, quartz sandstones and slates, occasionally with layers and lenses of gravelites. Thickness 250m.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

According to A., the lower boundary is conformable with the underlying formations of the Almalyk Fm

Upper contact

The upper boundary is not established. (460).

Regional extent

South slope of the Malguzar Mountains, left bank of the Sanzar River, basin of the Zaaminsu River.

GeoJSON

null

Fossils

Contains Middle Ordovician graptolites - Glyptograptus aff. teretiusculus (His.), Glossograptus cf. hinckii (Hopk.) and others; chitinozoa - Desmochitina minor Eis., Conochitina simplex Eis., C. schopfi Taug. (165).

Age

Middle Ordovician (Dapingian-Darriwilian)

Age Span:

Beginning stage:

Dapingian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

471.26

Ending stage:

Darriwilian

Fraction up in the ending stage:

1.0

Ending date (Ma):

458.18

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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