Duobak Fm
Period:
Cretaceous
Age Interval:
Lower Cenomanian, B2
Province:
Bukhara-SW Gissar
Type Locality and Naming
By the village of Duobak, South Gissar. M.R. Jalilov, 1968 (190, p.43). Stratotype on the right bank of the Shirkent River near the village of Duobak. Included in the Tyubegatan Horizon (56; 189; 452).
Synonym: Duobakskaya Suite, Дуобакская св.
Lithology and Thickness
Grey clays with layers of siltstone (aleurolites), shell rocks, glauconitic sandstones. Thickness 60-67m.
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
Conformably overlies the Shirabad Fm
Upper contact
It is conformably overlain by the Kharangon Fm.
Regional extent
Analog of the Tyubegatan Fm
GeoJSON
null
Fossils
Contains marine bivalve mollusks - Lopha dichotoma Bayle, Rhynchostreon pseudoconicum (Bobk.), Modiolus turkestanensis Rom.
Age
Belongs to the lower Cenomanian; in the Strat. vol. (446) - to the Cenomanian
Age Span:
Beginning stage:
Cenomanian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
100.50
Ending stage:
Cenomanian
Fraction up in the ending stage:
0.25
Ending date (Ma):
98.85
Depositional setting
Depositional pattern:
Additional Information
Compiler:
I.M. Abdurazimova – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”