Band Fm
Period:
Devonian
Age Interval:
Lower Devonian?, N3
Province:
Nuratau
Type Locality and Naming
Along the village of Band, foothills of the Khanbanditau mountains. P.N. Podkopaev, I.A. Suzdal'skaya, N.A. Bocharov et al. in 1958 (208, p.275; 441, p.57).
Synonym: Band Suite
Lithology and Thickness
Tuffs, lavas, subvolcanic formations predominantly of acidic to intermediate composition, variegated in color. Thickness over 900 m.
Lithology Pattern:
Volcanic_ash
Relationships and Distribution
Lower contact
Lower boundary unknown. Schematic stratigraphic column indicates Chimkurgan Fm
Upper contact
Schematic stratigraphic column indicates Uchkulach Fm
Regional extent
Bandsky Amphitheater Area, exposed drilling
GeoJSON
null
Fossils
Age
Age of Band Fm not precisely determined (165). P.N. Podkopaev et al. (1961) provisionally dated it to the Early Devonian. A.K. Bukharin et al. (1968), K.K. Pyatkov et al. (1971), N.M. Larin (Vashchenko, Larin, 1980) based on the results of absolute age determination of Bandsky volcanites, suggest their formation corresponds to the Eifelian epoch. O.I. Sergun'kova (1972) believes that the age of Bandsky Fm could be pre-Famennian, as she thinks it is overlain not by Middle Devonian but by Famennian deposits. L.V. Shpotova et al. in 1988 tentatively assigned these formations to the Upper Silurian-Lower Devonian. In the monograph (165) - Lower Devonian to Lower Middle Devonian. R.R. Usmanov et al. (1999) and on the State Geologic Map-500 of Uzbekistan (460) - provisionally determined as Early to Middle Devonian. A more objective determination of the age of Band Fm volcanites, apparently, can be the fact of their lying beneath the sedimentary formations of the Lower Uchkuylach Subsuite (Uchkuylach Fm) of the Eifelian Middle Devonian, i.e., provisionally Early Devonian age.
Age Span:
Beginning stage:
Emsian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
402.41
Ending stage:
Emsian
Fraction up in the ending stage:
1.0
Ending date (Ma):
394.30
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)”