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

Gazdagan Formation

Gazdagan Fm

Period:

Cretaceous

Age Interval:

Upper Cenomanian- Lower Turonian, B1, B1a

Province:
Bukhara-SW Gissar

Type Locality and Naming

In the Gazdagan gorge, southwest Gissar. M.R. Jalilov, 1968 (190, p.43). Stratotype on the southern slope of the Gazdagan gorge. Lowermost formation in Газдаганинская св.

Synonym: Gazdagan Suite, Газдаганинская св.

Lithology and Thickness

At the bottom, dark gray clays with rare interlayers of limestones (thickness 25-80m); at the top - gray, ferruginous clays (thickness 3-35m).

Lithology Pattern:

Claystone

Relationships and Distribution

Lower contact

It lies conformably on the Tagarin Fm (widespread) or Akmechet Fm (South Gissar)

Upper contact

It is conformably overlain by the Talhab Fm (or Chashmaobzan Fm).

Regional extent

Southwest Gissar, Babatag ridge.

GeoJSON

null

Fossils

Contains ammonites - Karamaites aktaschense Iljin, Mediasiceras lenaticulare (Lupp.), Calycoceras batyophalum Kossm., Metoicoceras bifurcatum Iljin, Sciponoceras romanovskii (Arkh.), Borrisiakoceras mirabile Arkh.; marine bivalve mollusks - Spondylus balakhanensis Bobk., S. likhatschevi Bobk., Korobkovitrigonia darwaseana (Rom.); gastropods - Caucasella caucasicum Pčel., Perrisoptera fragilis Dzhal. et Arust.; foraminifers - Haplophragmoides turonicus Zhuk,, Gaudryinopsis asiaticus N.Byk., G. akrabatensis (Zhuk.), Brotzenella berthelini Kell., Gümbelitria cenomana (Kell.); ostracods - Cytherella elegans Andrv., Schuleridea atraxa Mand., Brachycythere dotata Mand.

Age

It belongs to the upper Cenomanian - lower part of the lower Turonian; according to the "Decision ...., 1977" (383); in the Strat. vol. (446) - to the upper Cenomanian.

Age Span:

Beginning stage:

Cenomanian

Fraction up in beginning stage:

0.75

Beginning date (Ma):

95.55

Ending stage:

Turonian

Fraction up in the ending stage:

0.1

Ending date (Ma):

93.45

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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