Zindan Fm
Period:
Jurassic
Age Interval:
Middle Jurassic (Bajocian-Bathonian), F1
Province:
Fergana
Type Locality and Naming
Along the Zindan River, Fergana Ridge. V.N. Ognev, 1946 (336, p.34). Formation confirmed at the Samarkand conference. (382, table 13; 383, table 5, p.3; 445; 446).
Synonym: Zindanskaya Suite, Зинданская св.
Lithology and Thickness
Penetrated by boreholes in the Fergana Depression. Claystones, siltstone (aleurolites), sandstones, gravellites, coals. Thickness 350-550m.
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Conformably overlies the Chaartash Fm
Upper contact
It is unconformably overlain by the Balabansay Fm
Regional extent
Western spurs and the eastern part of the Fergana Range, basin of the Yassy River.
GeoJSON
null
Fossils
Contains large plant remains - Coniopteris spectabilis Brick, C. zindanensis Brick, Gingo sibirica Heer., Phoenicopsis angustifolia Heer. and others.
Age
Middle Jurassic. For schematic stratigraphic representation it is adjusted in (Bajocian-Bathonian)
Age Span:
Beginning stage:
Bajocian
Fraction up in beginning stage:
0.1
Beginning date (Ma):
170.63
Ending stage:
Bathonian
Fraction up in the ending stage:
0.8
Ending date (Ma):
165.87
Depositional setting
Depositional pattern:
Additional Information
Compiler:
V.V. Kurbatov – In: GeoGPT translation of: ”Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)"