Derbent Fm
Period:
Cretaceous
Age Interval:
Albian, B1a
Province:
Bukhara-SW Gissar
Type Locality and Naming
Along the village of Derbent, Southwest Gissar. Yu.N. Andreyev, 1969 (363, p. 28-29). Stratotype on the eastern slope of the Kugitangtau ridge. The term is not used.
Synonym: Derbent Suite, Дербентская св., Kalamazar suite.
Lithology and Thickness
Greenish clays with rare layers of shell rock. Thickness 40-75 m.
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
Lies conformably on the Karakuz Fm
Upper contact
Overlain conformably by the Luchak Fm.
Regional extent
Southwest Gissar, interfluve of Shirabad-Surkhandarya.
GeoJSON
null
Fossils
Contains ammonites - Douvilleiceras cf. mammillatum Schloth., Cleoniceras mangyshlakense Lupp., Cl. kugitangense Lupp., Cl. rudiki Iljin; marine bivalve mollusks - Amphidonte arduennensis Orb., foraminifers - Gaudryina okusbulakensis Kortch.; ostracods - Cytherella ovata Oertli.
Age
Belongs to the v. zone of the n. Albian. Enters the Derbent mountain (362). Strat. sl. (446).
Age Span:
Beginning stage:
Albian
Fraction up in beginning stage:
0.1
Beginning date (Ma):
111.93
Ending stage:
Albian
Fraction up in the ending stage:
0.3
Ending date (Ma):
109.39
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)”