Ilyalin Fm
Period:
Paleogene
Age Interval:
Middle Eocene (Lutetian (upper)-Bartonian (lower), U2
Province:
Ustyurt-Sultanuzdag
Type Locality and Naming
Along the village of Ilyaly, Turkmenistan. V.A. Ivanova, N.G. Popov, G.F. Panteleev, 1961 (207, p.124).
Synonym: Ilyalin Suite, Ильялинская св.
Lithology and Thickness
Clayey limestones, marls white, gray, dark-gray. Thickness 28m.
Lithology Pattern:
Clayey limestone
Relationships and Distribution
Lower contact
Conformably overlies the Karashor Fm
Upper contact
It is conformably overlain by the Kurtysh Fm
Regional extent
Southern Pre-Aral, Eastern Ustyurt. Correlated with the upper part of the Sugralin Fm of the Kyzylkum.
GeoJSON
null
Fossils
Contains foraminifers of the Acarinina rotundimarginata Subb. and Hantkenina alabamensis Cushm. zones; radiolarians - Cenosphaera kizilkumensis Lipm, C. colinus Moks., Sponclodiscus obsoletus Krachen.; nannoplankton of the NP 15-16 Nannotetrina fulgens and Discoaster bifax zones.
Age
Previously attributed to the lower part of the early Eocene. After the decision of the MSK on changing the volume of the middle Eocene (358), it is considered in the volume of the Acarinina rotundimarginata and Hantkenina alabamensis zones of the middle Eocene (upper part of the Lutetian-lower part of the Bartonian stage).
Age Span:
Beginning stage:
Lutetian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
44.55
Ending stage:
Bartonian
Fraction up in the ending stage:
0.5
Ending date (Ma):
39.37
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)”