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:
Bukhara-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

null

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)”