Kokyar Fm
Period:
Cretaceous
Age Interval:
Hauterivian-Aptian (?), F6
Province:
Fergana
Type Locality and Naming
By Koki-Yar, East Fergana. A.V. Sochava, 1965 (434, p.14). Stratotype in the lower reaches of the Tar River. Fifth formation in Changet Gr
Synonym: Kokyarskaya Formation, Кокьярская св.
Lithology and Thickness
Red-colored sandstones and clays with rare layers of blue siltstone (aleurolites) and clays. Thickness 200-680m
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Conformably overlies the Chalmin Fm
Upper contact
Conformably overlain by the Klaudzin Fm
GeoJSON
null
Fossils
Contains freshwater bivalve mollusks Trigonioides kodairaiformis Mart., Nakamuranaia chingshanensis Sur., Plicatounio naktongensis Kob. et Suz.
Age
Conditionally attributed to the Hauterivian-Aptian (?)
Age Span:
Beginning stage:
Hauterivian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
132.60
Ending stage:
Aptian
Fraction up in the ending stage:
0.5
Ending date (Ma):
117.30
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)”