Daudan Fm
Period:
Paleogene
Age Interval:
upper Eocene-lower Oligocene, U2
Province:
Ustyurt-Sultanuzdag
Type Locality and Naming
Along the old channel of the Amu Darya River - Daudan, S. Turkmenistan. A. G. Bliskavka, G. A. Gabrielyants, A. A. Zheleznov et al., 1965 (148, p.84).
Synonym: Daudan Suite, Дауданская св.
Lithology and Thickness
Greenish-gray clays, calcareous in the lower part. Thickness up to 200m.
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
Conformably overlies the Akchakain Fm
Upper contact
Conformably overlain by the Daryalyk Fm
Regional extent
Lower reaches of the Amu Darya River (Turtkul-Khivinsky district). Correlated with the Beloglin Horizon and Khadum Horizon.
GeoJSON
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Fossils
Contains foraminifera - Cibicidoides pseudoungirianus Cushm., Globigerina officinalis Subb. and others.
Age
Belongs to the upper Eocene-lower Oligocene, in the Strat. sl. (444) - to the lower-middle Oligocene, calcareous varieties presumably to the upper Eocene.
Age Span:
Beginning stage:
Rupelian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
33.90
Ending stage:
Rupelian
Fraction up in the ending stage:
0.5
Ending date (Ma):
30.60
Depositional setting
Depositional pattern:
Additional Information
Compiler:
A.A. Abdusamatov – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”