Sidi as Sid and Nefusa Fm
Period:
Cretaceous
Age Interval:
Cenomanian – Turonian, Lb1
Province:
Libya
Type Locality and Naming
Column: Tripolitania and Sirte Basin
Synonym:
Lithology and Thickness
Members: 1. Nalut (or Garian) dolomite, composed of hard, crystalline dolomitic limestone with bands of chert concretions 2. Yifran marl, which soft, thinly bedded marly limestones and claystones and intercalations of bedded gypsum, deposited in lagoonal to low-energy neritic and 3. Ain (Ayn) Tobi limestone, which is gray and yellow limestones and dolomites with thin marly interbeds.
Lithology Pattern:
Dolomitic limestone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Kikla and Cabao Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Mizdah Fm
Regional extent
GeoJSON
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Fossils
Age
Cenomanian – Turonian
Age Span:
Beginning stage:
Cenomanian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
100.50
Ending stage:
Turonian
Fraction up in the ending stage:
0.5
Ending date (Ma):
91.65
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.