Kichkina-Charvak Fm
Period:
Ordovician
Age Interval:
Ashgill, N6
Province:
Nuratau
Type Locality and Naming
By the village of Kichkina-Charvak, S. Nuratau Range. R.R. Usmanov et al. (1984f.) mapped and assigned to the Ilonchisay Fm; in 1988, they gave it the name Kichkinacharvak (Usmanov et al., 1988f.).
Synonym: Kichkinacharvak Suite, Кичкиначарвакская св.
Lithology and Thickness
Polymictic fine-grained sandstones, bluish-greenish-gray, greenish-gray, interbedded with siltstone (aleurolites) and clayey, clayey-mica slates of gray and dark-gray color. Thickness 250-500 m.
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Contacts with overlying deposits is tectonic (165; 460).
Upper contact
Contacts with underlying deposits is tectonic (165; 460).
Regional extent
GeoJSON
null
Fossils
Contains Ashgill graptolites - Paraorthograptus pacificus (Rued.), Amplexograptus sp., Climacograptus sp.
Age
Age Span:
Beginning stage:
Katian
Fraction up in beginning stage:
0.75
Beginning date (Ma):
447.10
Ending stage:
Hirnantian
Fraction up in the ending stage:
1.0
Ending date (Ma):
443.07
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Z.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)”