Mazul Ninah Fm
Period:
Paleogene
Age Interval:
Oligocene
Province:
Murzuq Basin
Type Locality and Naming
Synonym: Ma’zul Ninah Fm (Google Gemini cited)
References:
Lithology and Thickness
Composed of siliceous calcilutite and marly nodular limestone. Contains beds of calcareous clay, gypsum, and dolomitic limestone. Divided into lower and upper members.
Lithology Pattern:
Siliceous limestone
Relationships and Distribution
Lower contact
Unconformably overlies older Eocene units, such as the Rawaghah Member of the Bishima Fm.
Upper contact
Overlain by younger Miocene volcanic flows and basalt sheets, such as those from Jabal Assawda..
Regional extent
Mazul Ninah Fm represents the youngest pre-Quaternary fill sequence in specific structural depressions like the Hun Graben within the northwestern Sirt Basin.
GeoJSON
{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[10.976,25.209],[12.169,25.606],[13.321,26.008],[14.39,26.376],[15.419,26.748],[16.2,27.199],[16.735,26.044],[17.105,24.852],[16.982,23.663],[16.53,22.58],[15.871,21.533],[16.036,20.708],[17.023,20.089],[18.175,19.575],[19.45,19.247],[18.628,18.748],[16.776,18.604],[14.761,18.661],[12.992,18.923],[11.84,19.515],[11.223,20.335],[10.812,21.372],[10.524,22.613],[10.359,23.904],[10.976,25.209]]]}}
Fossils
Age
Shown in Fello (2001)’s Repsol regional column as Oligocene
Age Span:
Beginning stage:
Rupelian
Fraction up in beginning stage:
0.00
Beginning date (Ma):
33.90
Ending stage:
Chattian
Fraction up in the ending stage:
1.0
Ending date (Ma):
23.04
Depositional setting
Reflects a mix of transitional or continental-dominated depositional environments during the Oligocene epoch
Depositional pattern:
Additional Information
Compiler:
Enam O. Obiosio, Solomon Joshua Avong and Henry Nasir Suleiman (2026). The Cretaceous and Cenozoic entries were mainly taken from AI-assistant summaries of Google’s Gemini (accessed in Aug’2026)