Beshimah Fm
Period:
Paleogene
Age Interval:
Thanetian – Ypresian, Lb1
Province:
Libya
Type Locality and Naming
Lithology and Thickness
Members: 1. Rawaghah (Ruaga) chalk, composed of hard, massive dolomite and chalky dolomite. Occasionally brecciated and contains chert nodules and silicious limestone lenses 2. Wadi Zhakim (Formerly the Fluscolina limestone), which is chalky limestone and dolomite, deposited in a shallow marine environment and 3. Khier (Khayir) marl, which is composed of chalky gypsiferous marl and thin dolomitic limestone layers.
Lithology Pattern:
Dolomitic limestone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Shurfa Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Gir Gypsum Fm
Regional extent
GeoJSON
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Fossils
Age
Thanetian - Ypresian
Age Span:
Beginning stage:
Thanetian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
59.24
Ending stage:
Ypresian
Fraction up in the ending stage:
0.5
Ending date (Ma):
52.04
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Chart derived from: USGS Correlation Chart and Columnar Section for Rocks in Libya, 1963. Descriptions from: Hallet, Don: Petroleum Geology of Libya, 2002.