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

Munchak Formation

Munchak Fm

Period:

Neogene

Age Interval:

Upper Pliocene, B2

Province:
Bukhara-SW Gissar

Type Locality and Naming

Along the village of Munchak, Surkhandarya River. Y.R. Smolnikov et al., 1971.

Synonym: Munchak Suite, Мунчакская св.

Lithology and Thickness

Siltstone (aleurolites), sandstones, clays in the foothills with gravellites and conglomerates, brownish-brown and brownish-gray. Thickness 54-1326m.

Lithology Pattern:

Siltstone

Relationships and Distribution

Lower contact

It lies conformably or locally with erosion on the Yamchin Fm

Upper contact

It is overlain with erosion by the Sayrob Fm.

Regional extent

Baysun and Surkhandarya depressions. B.I. Pinhasov correlates it with the Khodzhalychin Fm and Shurasan Fm of the South-Western Gissar.

GeoJSON

null

Fossils

Contains ostracods - Darwinula stevensoni (Br. et Rob.), Candoniella albicaus (Brady), Ilyocypris sp., Cyprinotus sp., Limnocythere misera Mand., L. tenuireticulata Suzin., Cyprideis littoralis (Br.).

Age

According to A.A. and G.Yu. Alferov and others (61), the age is conditionally Upper Pliocene, paralleled with the Ammagan Fm.

Age Span:

Beginning stage:

Piacenzian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

3.09

Ending stage:

Piacenzian

Fraction up in the ending stage:

1.0

Ending date (Ma):

2.58

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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