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

Aktag Formation

Aktag Fm

Period:

Cretaceous

Age Interval:

Maastrichtian, B1

Province:
SW Gissar

Type Locality and Naming

Along the Achtak ridge, S.-W. Gissar. Kh.Kh. Mirkamalov, M.E. Egamberdyev, 1969 (300, p.62). Stratotype on the northern slope of the Achtak ridge. Upper formation in Tally-Khumon Gr

Synonym: Aktag Suite, Актагская св.

Lithology and Thickness

Clays with interlayers of limestone-rudstones in the lower part and sandstones - in the upper part. Thickness 140-200m.

Lithology Pattern:

Sandstone

Relationships and Distribution

Lower contact

Lies conformably on the Kantau Fm

Upper contact

locally unconformably overlain by the Kofrun-Cret Fm

Regional extent

South Central Gissar. Corresponds to the upper part of the Daralitaus Fm and the entire Udantua Fm (114). S.V. Lobacheva". Str. sl. (446).

GeoJSON

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Fossils

Contains ammonites - Bostrychoceras sp.; marine bivalve mollusks - Сегаtostreon spinosum Math., Amphidonte pyrenaica Leym., Gyropleura aktagensis Bobkova; sea urchins - Hemiaster lacunosus Slocum.

Age

Belongs to the Maastrichtian.

Age Span:

Beginning stage:

Maastrichtian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

72.17

Ending stage:

Maastrichtian

Fraction up in the ending stage:

0.5

Ending date (Ma):

69.11

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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