Lyakan Fm
Period:
Cretaceous
Age Interval:
Lower Cretaceous (Albian), F9
Province:
Fergana
Type Locality and Naming
Along the village of Lyakan, South Fergana. O.S. Vyalov, 1938 (89, p.92). Stratotype not specified.
Synonym: Lyakan Suite, Ляканская св.
Lithology and Thickness
Gray, pink, white limestones with layers of red clays. Thickness 20-50m.
Lithology Pattern:
Clayey limestone
Relationships and Distribution
Lower contact
It lies unconformably on the Paleozoic and conformably on the Muyan Fm
Upper contact
It is overlain conformably by the Kyzylpilyal Fm
Regional extent
Southern and Western Fergana.
GeoJSON
null
Fossils
Contains ostracods - Timiriasevia polimorpha Mand., T. simakovi Mand.; freshwater bivalve mollusks Pseudohyria mujanica Mart.
Age
It is assigned to the Upper + Middle — to the Lower Cretaceous (154); according to S.N. Simakov (416) and N.N. Verzilin (383) — to the Albian; according to (55) — to the Upper Albian; according to A. — to the Cenomanian.
Age Span:
Beginning stage:
Albian
Fraction up in beginning stage:
0.4
Beginning date (Ma):
108.12
Ending stage:
Albian
Fraction up in the ending stage:
0.8
Ending date (Ma):
103.04
Depositional setting
Depositional pattern:
Additional Information
Compiler:
I.M. Abduazimova – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”