Obailyn Fm
Period:
Paleocene
Age Interval:
middle Eocene (Lutetian)
Province:
Zaisan (Zaysan) Basin - East
Type Locality and Naming
Synonym: E2ob
Lithology and Thickness
28.6 m of Variegated clays, locally sandy with iron and manganese oxides, containing manganese concretions in the middle part of the sequence. At the base, fragments of turtle shells and mammal remains are present. The foundation consists of yellowish-brown, variably-grained sands.
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
Unconformable onto the Chakpaktas Fm
Upper contact
Unconformably overlain by the Sargamys Fm
Regional extent
GeoJSON
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Fossils
Age
middle Eocene (shown as late-middle Lutetian, very brief); bound by minor hiatuses of uncertain extent (not included in age span here)
Age Span:
Beginning stage:
Lutetian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
44.55
Ending stage:
Lutetian
Fraction up in the ending stage:
0.75
Ending date (Ma):
42.79
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Information provided by Nariman Jamikeshev from Kazakh-language sources and from other publications.