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

Almurad Formation

Almurad Fm

Period:

Cretaceous

Age Interval:

Valanginian - Lower Hauterivian, B1, B3

Province:
SW Gissar

Type Locality and Naming

Along Almurad Mountain, South-Western Gissar. N.P. Kheraskov, 1934 (487, p.18). In the Bukhara-Karshinsky region, well exposed. Stratotype at r. Almurad. Middle formation in the Takchiyan Gr. Included in the Almurad horizon (55; 115; 133; 167; 274; 362; 415; 445; 498).

Synonym: Almurad Suite, Алмурадская св.

Lithology and Thickness

The formation is predominantly three-membered in structure.

At the bottom - clays, siltstone (aleurolites), reddish-brown sandstones with gypsum interlayers;

Middle part - marls, dolomites, bluish-gray clays, in the north (Lyangar, Chakchar, Machay) - reddish-brown clays, siltstone (aleurolites), gypsums with interlayers of gray sandstones and gravelites;

At the top - siltstone (aleurolites), reddish-brown clays with gypsum interlayers.

In the Babatag Ridge, the formation is composed of reddish-brown clays with gypsum interlayers.

Thickness 36-195m.

Lithology Pattern:

Siltstone

Relationships and Distribution

Lower contact

Lies conformably, locally transgressively on the Karabil Fm

Upper contact

Conformably overlain by the Kyzyltash Fm.

Regional extent

Southwestern, Southern Gissar, Babatag Ridge.

GeoJSON

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Fossils

Contains marine bivalve mollusks - Lima tombeckiana Orb., Pterotrigonia caudata (Ag.), Astarte beamonti Orb.; ostracods - Malzevia ex gr. pellucida (And.).

Age

Belongs to the Valanginian - Lower Hauterivian; according to Yu.N. Andreyev, - to the upper Valanginian - Lower Hauterivian (362); Along "Resolution.....,1977" (383) - to the Berriasian - Lower Hauterivian; in Str. sl. (446)- to the Berriasian - Lower Hauterivian.

Age Span:

Beginning stage:

Valanginian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

137.70

Ending stage:

Hauterivian

Fraction up in the ending stage:

0.5

Ending date (Ma):

129.55

Depositional setting

Depositional pattern:

Additional Information

Compiler:

I.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)”