Ustrichnaya Fm
Period:
Cretaceous
Age Interval:
Upper Cretaceous (Cenomanian-Turonian), F9, F9e, F9f
Province:
Fergana
Type Locality and Naming
F.N. Chernyshev, M.M. Bronnikov, V.N. Weber, A.V. Faas, 1910 (496).
Synonym: Ustrichnaya (=Oyster) Topitsa, Устричная т.
Lithology and Thickness
Green clays, shell limestones. Thickness 11-230m.
Lithology Pattern:
Clayey limestone
Relationships and Distribution
Lower contact
Conformably overlies the Gulchin Fm, Kalachin Fm, Karamalmin Fm
Upper contact
It is overlain with erosion by the Yalovach Fm
Regional extent
Fergana.
GeoJSON
null
Fossils
Contains ammonites - Metoicoceras swallowi asiaticum Iljin, Beschtubeites aff. kysylkurganensis (Lupp.), Gombeoceras kanicum Stank.; marine bivalve mollusks Rhynchostreon columbum (Lam.), Exogyra olissiponensis Sharpe, Gryphaea tucumcarii Böse, Liostrea delettrei Coq., Megatrigonia turkestanensis (Arkh.), Corbula muschketovi Böhm.; gastropods - Torquesiella subfittoni Pčel.
Age
Belongs to the upper Cenomanian - middle Turonian.
Age Span:
Beginning stage:
Cenomanian
Fraction up in beginning stage:
0.8
Beginning date (Ma):
95.22
Ending stage:
Turonian
Fraction up in the ending stage:
0.5
Ending date (Ma):
91.65
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)”