Udantau Fm
Period:
Cretaceous
Age Interval:
Maastrichtian, B1a
Province:
Bukhara-SW Gissar
Type Locality and Naming
In the Udantau Mountains, Gissar Range. M.R. Jalilov, 1968 (190, p.42). Stratotype in the Gazdagan gorge, along the banks of the Muzrabat River. It is part of the Udantau horizon (56; 189; 383; 446; 452).
Synonym: Udan-Tau Fm; Udantau suite, Удантауская св.
Lithology and Thickness
Greenish-gray sandstones, siltstone (aleurolites) with clay interlayers. Thickness 65-165m.
Lithology Pattern:
Fine-grained sandstone
Relationships and Distribution
Lower contact
It lies conformably on the Daralitau Fm
Upper contact
It is overlain conformably by the Kofrun-Cret Fm
Regional extent
Southwestern Gissar.
GeoJSON
null
Fossils
Contains marine bivalves - Amphidonte pyrenaica (Leym.); sea urchins - Hemipneustes striatoradiatus elevatus (Smiser); foraminifers Bolivina incrassata incrassata (Reuss), Brotzenella complanata (Reuss).
Age
It belongs to the Maastrichtian; According to A., - to the early Maastrichtian (?).
Age Span:
Beginning stage:
Maastrichtian
Fraction up in beginning stage:
0.1
Beginning date (Ma):
71.56
Ending stage:
Maastrichtian
Fraction up in the ending stage:
0.5
Ending date (Ma):
69.11
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)”