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

Gissarak Formation

Gissarak Fm

Period:

Paleogene

Age Interval:

Lower Oligocene, B1

Province:
Bukhara-SW Gissar

Type Locality and Naming

Along the village of Gissar, Tupolang River basin, Tajikistan. G.Kh.Salibaev, 1967 (399, p.42), in the rank of layers. Stratotype in the Tupolang River area, near the village of Gissar.

Synonym: Gissarak Horizon, Гиссаракский гор.

Lithology and Thickness

Clays and sandstones, limestones in the lower part. Up to 100 m.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

Lies unconformably on the Turkestan-Sumsar Horizon

Upper contact

Overlain by the Shurysay Fm.

Regional extent

Western Tajikistan, southern slope and southwestern spurs of the Gissar Range. Correlated with the "r" horizon of K.P.Kalitsky's scheme (213), corresponds to the lower part of the Kyzylchin Fm. G.P.Kraydenkov (246) includes these deposits in the Shurysay Fm layers.

GeoJSON

null

Fossils

Contains marine bivalve mollusks - Tellina nysti Desh., Polymesoda convexa Brong., Callista bajsunica Varenz.-Man., Cyrtodaria angusta Nyst. et West., Lentidium georgiana Zotova; gastropods - Ptychopotamides margaritaceus Broc., ostracods - Citheridea schirabadensis Mand., Cypridopsis sp.

Age

Lower Oligocene. In the Strat. layers (444) it is distinguished in the rank of layers and is attributed to the Lower Middle Oligocene.

Age Span:

Beginning stage:

Rupelian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

33.90

Ending stage:

Rupelian

Fraction up in the ending stage:

1.0

Ending date (Ma):

27.29

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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