Shurysay Fm
Period:
Neogene
Age Interval:
Lower Miocene, B2
Province:
Bukhara-SW Gissar
Type Locality and Naming
By the valley of Shurysay, south of the Gissar ridge, Tajikistan. M.N. Gramm, 1949 (177, p. 5).
Synonym: Shurysayskaya Suite, Шурысайская св.
Lithology and Thickness
Marine red-colored sandstones, siltstone (aleurolites), clays, gypsums. Thickness up to 338 m.
Lithology Pattern:
Fine-grained sandstone
Relationships and Distribution
Lower contact
Overlies the Upper Eocene with erosion
Upper contact
Overlain with erosion by the Gadzhak Fm
Regional extent
Tajik Depression and Southwest Gissar.
GeoJSON
null
Fossils
Contains mollusks - Cardium (Cerastoderma) cf. levinae Merkl., C. helmerseni Iljina, Corbula cf. helmerseni Mikh.; ostracods - Cetheridea miilleri (Münster), C. kamilla Ros.
Age
M.N. Gramm (177) referred the marine red-colored deposits of the Tajik Depression to the Shurysay Horizon and dated it to the Oligocene. In the Surkhandarya depression, where the section of the horizon is incomplete, and only the deposits of its upper part are present, Y.R. Smolnikov et al. (1971) distinguished them at the rank of a formation, retained the name Shurysay for it, and based on mollusks justified its Early Miocene age, correlating it with the Kyzylchin Fm of Southwest Gissar.
Age Span:
Beginning stage:
Aquitanian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
23.04
Ending stage:
Aquitanian
Fraction up in the ending stage:
1.0
Ending date (Ma):
20.45
Depositional setting
Depositional pattern:
Additional Information
Compiler:
B.I. Pinhasov – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”