Neogene

Paleogene

Cretaceous

Jurassic

Triassic

Permian

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Neoproterozoic

Mesoproterozoic

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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:
Bukhara-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

null

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)”