Tanzuft Shale Fezzan Basin Fm
Period:
Silurian
Age Interval:
Province:
Libya
Type Locality and Naming
Column: Fezzan Basin
Lithology and Thickness
Tanzuft Shale Fm LITHOLOGY= Tanzuft (Tannezuft) Shale - USGS chart places this formation in the Llandoverian stage, at the base of the Silurian. Important unit for petroleum exploration. One of the major source rocks in North Africa. Dark gray marine, graptolitic shales with thin siltstone and sandstone stringers in the lower part. Deposited in a turbiditic environment, with the top of the unit is hummocky and cross-stratified. The lower part contains hot shales (radioactive), with Uranium levels probably deposited as aeolian volcanic ash. CALIBRATION = Base of Silurian. REFERENCE = Chart derived from: USGS Correlation Chart and Columnar Section for Rocks in Libya, 1963. Descriptions from: Hallet, Don: Petroleum Geology of Libya, 2002.
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
Upper contact
Regional extent
GeoJSON
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[15,29],[14,28],[15,27],[16,28],[15,29]]]]}}
Fossils
Age
Age Span:
Beginning stage:
Rhuddanian
Fraction up in beginning stage:
0
Beginning date (Ma):
443.07
Ending stage:
Ludfordian
Fraction up in the ending stage:
0
Ending date (Ma):
425.01
Depositional setting
Depositional pattern:
Additional Information
long: 15 lat: 28
Compiler: