Darnah Fm
Period:
Paleogene
Age Interval:
Lutetian – Bartonian, Lb3
Province:
Libya
Type Locality and Naming
Column: Cyrenaica Basin
Synonym: Derna Fm
Lithology and Thickness
100m of nummulitic and reefal limestones, which contain fossils of corals, algae, and nummulites. Also contains massive beds of chalky limestone in some regions, with occasional marl partings. The upper part of this unit is represented by several cycles of shoal and channel facies.
Lithology Pattern:
Limestone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Apollonia Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Salantah Fm
Regional extent
GeoJSON
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Fossils
Age
Lutetian – Bartonian
Age Span:
Beginning stage:
Lutetian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
44.55
Ending stage:
Bartonian
Fraction up in the ending stage:
1.0
Ending date (Ma):
37.71
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.