Kurusay Fm
Period:
Ordovician
Age Interval:
Lower-Middle Ordovician (?), CK9c
Province:
Chatkal-Kuramin Region
Type Locality and Naming
Along Kurusay, Mogoltau Mountains, Tajikistan. B.N. Nasedov in 1935 (219, p. 88). Stratotype on the right bank of the Kurusay.
Synonym: Kurusay Suite, Курусайская св.
Lithology and Thickness
Greenish-gray and dark chlorite-sericite slates, claystones, and siltstone (aleurolites). Thickness up to 1000m.
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
Lower boundary not established
Upper contact
upper boundary normal with the Kayrak-Ord Fm of the upper Ordovician, Ashgillian
Regional extent
South slope of the Mogoltau Mountains.
GeoJSON
null
Fossils
Organic remains not found.
Age
The age of the suite is conditionally determined as early-middle Ordovician based on its position in the section below the Kayrak-Ord Fm. B.N. Nasedov, based on the degree of metamorphism of the deposits, attributed the suite to the Proterozoic; E.D. Karpova and P.N. Sokolov (219) determined the age of the suite as early Paleozoic, establishing that the metamorphism of the rocks was caused by the contact effect of the Muzbulak granitoid intrusion.
Age Span:
Beginning stage:
Tremadocian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
486.85
Ending stage:
Katian
Fraction up in the ending stage:
1.0
Ending date (Ma):
445.21
Depositional setting
Depositional pattern:
Additional Information
Compiler:
A.I. Kim – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”