Jamangarin Fm
Period:
Neogene
Age Interval:
early Miocene
Province:
Zaisan (Zaysan) Basin - East
Type Locality and Naming
Synonym: N1zm
Lithology and Thickness
24.1 m of Light-gray sands, locally bright-yellow and ferruginous, with iron crusts, fine- to medium-grained, polymictic composition with rare interlayers of light greenish-gray siltstones. At the top - greenish-gray and brown clays (8-10 m) with inclusions of light-gray marl concretions.
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Unconformable onto the Nurin Fm
Upper contact
Unconformably overlain by the Zaisan Fm
Regional extent
GeoJSON
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Fossils
Age
early Miocene (mid-Aquitanian to early Langhian?); bound by minor hiatuses of uncertain extent (not included in age span here)
Age Span:
Beginning stage:
Aquitanian
Fraction up in beginning stage:
0.25
Beginning date (Ma):
22.39
Ending stage:
Langhian
Fraction up in the ending stage:
0.5
Ending date (Ma):
14.91
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Information provided by Nariman Jamikeshev from Kazakh-language sources and from other publications.