Gulchin Fm
Period:
Cretaceous
Age Interval:
Upper Cretaceous (upper Cenomanian), F9d
Province:
Fergana
Type Locality and Naming
By the village and river of Gulcha, Alai ridge. O.S. Vyalov, 1945 (156, p.286). Stratotype not specified. Uppermost formation in Changet Gr
Synonym: Gulchinskaya Suite, Гульчинская св.
Lithology and Thickness
Oolitic, organogenic limestones with clay interlayers. Up to 1-20 m.
Lithology Pattern:
Oolitic limestone
Relationships and Distribution
Lower contact
Conformably overlies the Budali Fm
Upper contact
It is conformably overlain by the Ustrichnaya Fm
Regional extent
Southeastern Fergana, Naukat depression. Enters the Tagarin mountain. Previously, these deposits were included in the exogirous mountain of the oyster bed (Ustrichnaya Fm) (56; 361; 414; 416; 445; 452).
GeoJSON
null
Fossils
Contains marine bivalve mollusks - Lima canalifera Goldf., Caprotina sp., Ichthyosarcolites bicarinatus Gemm.; gastropods - Nerinea ferganensis Pčel.
Age
Belongs to the middle Cenomanian. Along N.N. Bobkova (446), - to the upper Cenomanian. Considered upper Cenomanian to show lithology schematically.
Age Span:
Beginning stage:
Cenomanian
Fraction up in beginning stage:
0.7
Beginning date (Ma):
95.88
Ending stage:
Cenomanian
Fraction up in the ending stage:
0.8
Ending date (Ma):
95.22
Depositional setting
Depositional pattern:
Additional Information
Compiler:
I.M. Abdouazimova – In: GeoGPT translation of: ”Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)"