Gumatag Fm
Period:
Permian
Age Interval:
Lower Permian, B1, B2
Province:
Bukhara-SW Gissar
Type Locality and Naming
By the village of Gumata, Mt. Baysuntau. E.D. Bezuglov et al. in 1980 based on materials by V.M. Velitchenko and A.A. Popova (1966) (460, p. 212).
Synonym: Gumatag Suite, Гуматагская св.
Lithology and Thickness
Conglomerate-breccia limestones, polymictic conglomerates and gravelites, arkosic sandstones, quartz and mica siltstone (aleurolites). O.I. Nikitina et al. (1993) note the presence of rhyolites and their tuffs, tuffites. Thickness 250m.
Lithology Pattern:
Aus Conglomerate
Relationships and Distribution
Lower contact
It lies with angular unconformity on the Alachapan Fm
Upper contact
It is unconformably overlain by basalts of the Kayrak-Perm Fm.
Regional extent
South of the Baysuntay Range.
GeoJSON
null
Fossils
In boulders, early Gzhelian foraminifers - Triticites refertus Bensh, T. Dictyoclostus tjanshanica Bensh (102) are present.
Age
Based on these data and stratigraphic position, an early Permian age is established. V.M. Velitchenko and A.A. Popov (1966) based on identified Bashkirian, Kasimovian, and Gzhelian foraminifers found in limestone fragments from the basal conglomerates of the suite, accept a late Carboniferous (Gzhelian) - early Permian age for these deposits. F.R. Bensh (102; 107) considers them late Carboniferous, Gzhelian.
Age Span:
Beginning stage:
Asselian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
298.89
Ending stage:
Asselian
Fraction up in the ending stage:
1.0
Ending date (Ma):
293.52
Depositional setting
Depositional pattern:
Additional Information
Compiler:
V.V. Mikhailov – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”