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

Tumsay Formation

Tumsay Fm

Period:

Silurian

Age Interval:

Llandovery, N8

Province:
Nuratau

Type Locality and Naming

Along Tumsai, Karachatyr Mountains, South Nuratau Ridge, I.A. Pyanova in 1984 (371, p. 38). The term is no longer in use.

Synonym: Tumsai Suite, Тумсайская св.

Lithology and Thickness

Quartz, quartz-feldspathic sandstones, siltstone (aleurolites), slates, in the lower part with lenses and layers of acidic tuffs. Thickness about 150 m.

Lithology Pattern:

Sandstone

Relationships and Distribution

Lower contact

Contacts with adjacent layers are almost everywhere tectonic, only in Tashlaksa with underlying layers - normal stratigraphic.

Upper contact

Contacts with adjacent layers are almost everywhere tectonic

Regional extent

South Nuratau Ridge, Karatau Mountains (basin of the Kurai, Sharlak, Kyzyl-Tut, Aktapo rivers, etc.); Karachatyr.

GeoJSON

null

Fossils

Contains graptolites of the zones Spirograptus minor–Spirograptus turriculatus and Globosograptus crispus of the lower-middle part of the Late Llandovery; chitinozoa Lagenochitina sp., Sphaerochitina sp., indicating a Silurian age.

Age

According to Strat. sl. (443), the span and age of the suite require clarification. R.S. Khan et al. (1989), R.R. Uzakov et al. (1989), V.S. Korsakov et al. (1993) separated the Lower-Middle Ordovician deposits of the Badamchali Fm, from the Lower, Middle, Upper Llandovery deposits of the Nakrut Fm, from the terrigenous-volcanogenic deposits of the Dzhazbulak Fm, and separated the flyschoid Wenlock deposits of the Nauchatsay Fm from the composition of the Tumsay Fm.

Age Span:

Beginning stage:

Rhuddanian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

441.78

Ending stage:

Rhuddanian

Fraction up in the ending stage:

1.0

Ending date (Ma):

440.49

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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