Tashkurgan Fm
Period:
Devonian
Age Interval:
Middle Devonian, Z4
Province:
Zarafshan-N.Gissar
Type Locality and Naming
Named after the Tashkurgan Mountains, southeastern part of the Kara-Tyube Mountains. V.S. Korsakov in 1991 (1993)
Synonym: Tashkurgan Suite, Ташкурганская св.
Lithology and Thickness
Layered limestones with numerous layers of black cherts and rare dolomites. Thickness 700-1100m.
Lithology Pattern:
Siliceous limestone
Relationships and Distribution
Lower contact
Relationships with enclosing deposits are tectonic. Schematic stratigraphic column indicates the lower contact as Khozretdavut Fm
Upper contact
Relationships with enclosing deposits are tectonic. Schematic stratigraphic column indicates the upper contact as Ravat-Carb Fm
Regional extent
Kara-Tyube Mountains.
GeoJSON
null
Fossils
Crinoids - Cyclocyclicus katranensis Yelt., C. laticalis Yelt., Cupressocrinites ovatus Schew., characteristic for the Middle Devonian
Age
Middle Devonian age is established by crinoids and by comparison with coeval deposits of the Zirabulak-Ziaetdin Mountains.
Age Span:
Beginning stage:
Eifelian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
394.30
Ending stage:
Givetian
Fraction up in the ending stage:
1.0
Ending date (Ma):
378.90
Depositional setting
Depositional pattern:
Additional Information
Compiler:
V.S. Korsakov, 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)”