Machay Fm
Period:
Cretaceous
Age Interval:
upper Barremian, B1-B3
Province:
Bukhara-SW Gissar
Type Locality and Naming
Along the Machaidarya River, Southwest Gissar. X.X. Mirkamalov, 1971 (51, p.61). Stratotype near the village of Ykorymachi (north of Derbent). According to A., included in the Okuzbulak Gr as the lower part. (55; 446; 452).
Synonym: Machayskaya Suite, Machaylin Fm, Мачайская св.
Lithology and Thickness
Siltstone (aleurolites), reddish-brown clays with layers of gypsum. Thickness 10-50m.
Lithology Pattern:
Gypsiferous claystone
Relationships and Distribution
Lower contact
Overlies conformably the Kyzyltash Fm
Upper contact
Conformably overlain by the Kundalyangtau Fm.
Regional extent
GeoJSON
null
Fossils
Contains foraminifera - Quiqueloculina micra complanata (S.Mam.); freshwater bivalve mollusks - Lymnocerena Gissarica Martins., L. pussiloides Martins.; ostracods - Malzevia malzi Andrv.
Age
Belongs to the upper Barremian; according to A., and in Strat. lex. (446) - to the Barremian.
Age Span:
Beginning stage:
Barremian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
123.95
Ending stage:
Barremian
Fraction up in the ending stage:
1.0
Ending date (Ma):
121.40
Depositional setting
Depositional pattern:
Additional Information
Compiler:
– In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”