Agitmin Fm
Period:
Neogene
Age Interval:
middle-upper Miocene, K1-K9
Province:
Kyzylkum Region
Type Locality and Naming
Agitmin Basin, Central Kyzylkum. M.N. Gramm, 1959 (179, p. 630). Stratotype in the Agitmin Depression.
Synonym:
Lithology and Thickness
Siltstones (aleurolites) reddish-brown, subordinate sandstones. Thickness 50-250 m.
Lithology Pattern:
Siltstone
Relationships and Distribution
Lower contact
Overlies with erosion on the Sarbatyr-Paleog Fm. In the northeastern part of the Balkhun (Turtkul) depression, it overlies the analogs of Sakaraul Fm.
Upper contact
Overlain by the upper Pliocene (Kalkanatin-Neog Fm).
Regional extent
Central Kyzylkum.
GeoJSON
null
Fossils
Contains freshwater ostracods - Eucypris excistus Gr., E. aggeratus Gr., E. medius Gr., E. validus Gr., Limnocythere kushnari Gr.; in the lower part - marine and brackish water - Cythiridae crenata Gr., C. mulleri Munst.
Age
According to A., conditionally upper Oligocene (179), later lower Miocene (458). G.Yu. Alferov, V.G. Danilov (166) assigned it to the middle-upper Miocene. B.I. Pinhasov dates it to the lower-middle Miocene, i.e., Kotsakhur-Sarmatian. Here, red-colored continental deposits of the formation in the upper part of the section interbed with shallow marine and lagoon variegated clays and gypsums of the Sarmatian (346). East of the Karabik-Khivin isthmus in the Daryalyk-Daudan depression and in the southeastern Ustyurt, continental deposits of the suite are completely facially replaced by marine formations of the Kotsakhur-Sarmatian.
Age Span:
Beginning stage:
Langhian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
15.99
Ending stage:
Tortonian
Fraction up in the ending stage:
1.0
Ending date (Ma):
7.25
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)”