Akakus Sandstone Fezzan Basin Fm
Period:
Silurian
Age Interval:
Province:
Libya
Type Locality and Naming
Column: Fezzan Basin
Lithology and Thickness
Akakus Sandstone Fm LITHOLOGY= Akakus (Acacus) Sandstone - USGS Chart places this formation in the Upper Silurian, in the Ludlovian stage. Fine to medium-grained silty sandstone, thinly bedded, and frequently cross-bedded with ripple marks and flute marks. The top of the unit contains a ferruginous sandstone horizon which contains stromatolitic structures. Trace fossils include trilobite burrows. Depositional environment ranges from fluvial to shallow marine with tidal bars. CALIBRATION = Base of Ludfordian . 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:
Fine-grained sandstone
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:
Ludfordian
Fraction up in beginning stage:
0
Beginning date (Ma):
425.01
Ending stage:
Lochkovian
Fraction up in the ending stage:
0
Ending date (Ma):
419.00
Depositional setting
Depositional pattern:
Additional Information
long: 15 lat: 28
Compiler: