Yamchin Fm
Period:
Neogene
Age Interval:
Upper Pliocene, B2
Province:
Bukhara-SW Gissar
Type Locality and Naming
Along the Yamchisay, Baysun Depression. Yu.R. Smolnikov et al., 1971.
Synonym: Yamchinskaya Suite, Ямчинская св.
Lithology and Thickness
Sandstones, siltstone (aleurolites), clays, in foothills - grayish-brown and brownish-gray gravelites and conglomerates. Thickness 298-1014m.
Lithology Pattern:
Fine-grained sandstone
Relationships and Distribution
Lower contact
Conformably overlies the Kofrun-Neog Fm
Upper contact
Conformably overlain by the Munchak Fm
Regional extent
Southwestern. Gissar, Tajik Depression, Baysun and Surkhandarya Depressions. B.I. Pinhasov - upper Pliocene and correlates it with the Uchkolsay Fm and the lower parts of the Shurasan Fm of S.-W. Gissar.
GeoJSON
null
Fossils
Contains ostracods Zonocypris elongata Schn., Limnocythere luculenta Liv., Candona combiba Liv., Candoniella clovatu Mand.
Age
A.A. assigns the suite to the upper Miocene - middle Pliocene, G.Yu. Alferov et al. (61) consider the suite conditionally lower - middle Pliocene.
Age Span:
Beginning stage:
Piacenzian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
3.60
Ending stage:
Piacenzian
Fraction up in the ending stage:
0.5
Ending date (Ma):
3.09
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)”