Shurfa Fm
Period:
Paleogene
Age Interval:
Danian – Selandian, Lb1
Province:
Libya
Type Locality and Naming
Lithology and Thickness
Members: 1. Ammur, or Operculina limestone, which is composed of cavernous dolomitic limestone rich in near-shore large foramanifera. 2. Qaltah (Formerly Gelta or Guelta) chalk, which is comprised of blocky soft chalk, deposited in shallow marine environment. Macrofossils uncommon. 3. Abu Ra (Formerly Bu Ras) marl, well-bedded platy marlstones and chalky limestones which are brecciated and conglomeratic.
Lithology Pattern:
Shallow-marine marl
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Al Hamra Gr (Zimam Fm)
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Beshimah Fm
Regional extent
GeoJSON
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Fossils
Age
Danian – Selandian
Age Span:
Beginning stage:
Danian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
66.04
Ending stage:
Selandian
Fraction up in the ending stage:
1.0
Ending date (Ma):
59.24
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.