Kurtysh Fm
Period:
Paleogene
Age Interval:
Middle Eocene (Bartonian), U2
Province:
Ustyurt-Sultanuzdag
Type Locality and Naming
Along Kuryshbaba, South. Turkmenistan. E.I. Saperson, A.A. Zheleznov, 1962 (404, p.894).
Synonym: Kurtyshskaya Formation, Куртышская св.
Lithology and Thickness
Silty (aleuritic), calcareous clays, gray, greenish-gray marls. Thickness up to 240 m.
Lithology Pattern:
Sandy claystone
Relationships and Distribution
Lower contact
Lies conformably on the Ilyalin Fm
Upper contact
It is conformably overlain by the Ahchakain Fm
Regional extent
South Pre-Aral (pre-Aral), East Ustyurt. It is correlated with the Kultaban Fm of the Kyzylkum.
GeoJSON
null
Fossils
Contains foraminifera - Globigerina turkmenica Khal., Bolivina asiatica Moroz., Acarinina rugosoaculeata Subb.; radiolarians - Cenodiscus vulgaris Moks., C. subtilus Moks., Sethopyramis victori Lipm., nanoplankton of the NP-17 zone - Discoaster saipanensis.
Age
Belongs to the Middle Eocene (Bartonian stage). Until the decision of the MGS (358), it was attributed to the Upper Eocene.
Age Span:
Beginning stage:
Bartonian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
39.37
Ending stage:
Bartonian
Fraction up in the ending stage:
1.0
Ending date (Ma):
37.71
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)”