Chashmin Fm
Period:
Proterozoic
Age Interval:
Vendian-lower Cambrian (?), N8
Province:
Nuratau
Type Locality and Naming
Along the village of Chashma, the southern Nuratau Range. R.R.Usmanov (Korsakov et al., 1993f.) The stratigraphic name not recommended for use.
Synonym: Chashmin Suite, Чашчинская св.
Lithology and Thickness
Sandstones, gravelites, slates. Thickness more than 1000 m.
Lithology Pattern:
Sandstone
Relationships and Distribution
Lower contact
Lower boundary unknown
Upper contact
According to A.A., gradually (?) overlain by the deposits of the Zivachisay Fm.
Regional extent
Southern Nuratau Range, basin of the Kuraev, Chashma, and Kokcha rivers (analogue of the Kansay suite).
GeoJSON
null
Fossils
Age
Age established conditionally by stratigraphic position. It is not excluded that it has a Paleozoic (Ordovician-Silurian) age. I.A.Pyanovskaya et al. (371) attributed it to the Kutambulak Fm (lower-middle Cambrian), Tansaray Fm (upper Silurian); A.I.Skakun et al. (1989f.) - to the Sartbulak Fm (lower Silurian); on the State Geol. Map-500 of Uzbekistan (460) conditionally attributed to the Vendian-lower Cambrian.
Age Span:
Beginning stage:
Cryogenian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
720.00
Ending stage:
Cambrian Stage 2
Fraction up in the ending stage:
1.0
Ending date (Ma):
521.00
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Z.M.Abdouazimova – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”