Ezanga North Gabon Subbasin West Fm
Period:
Cretaceous
Age Interval:
Province:
Gabon General lithology
Type Locality and Naming
Column: North Gabon Subbasin West
Lithology and Thickness
Ezanga Fm:
LITHOLOGY = The region-wide salt unit is represented in the onshore parts of the Interior, North, and South Gabon subbasins by the Ezanga Formation, as much as 800 m thick, whereas in the offshore part of the Gabon Basin, the Ezanga may be as much as 1,000 m thick. The true thickness is difficult to estimate because of the extensive salt deformation. It consists of mainly carnallite and minor amounts of bischofite. Anhydrite, where present, is restricted to intertongued beds and to caps on some salt diapirs.
CALIBRATION = 86% up in the Aptian.
REFERENCE = Figure 10, U.S. Geological Survey "Geology and Total Petroleum Systems of the West-Central Coastal Province (7203), West Africa" Bulleton 2207-B
LITHOLOGY = The region-wide salt unit is represented in the onshore parts of the Interior, North, and South Gabon subbasins by the Ezanga Formation, as much as 800 m thick, whereas in the offshore part of the Gabon Basin, the Ezanga may be as much as 1,000 m thick. The true thickness is difficult to estimate because of the extensive salt deformation. It consists of mainly carnallite and minor amounts of bischofite. Anhydrite, where present, is restricted to intertongued beds and to caps on some salt diapirs.
CALIBRATION = 86% up in the Aptian.
REFERENCE = Figure 10, U.S. Geological Survey "Geology and Total Petroleum Systems of the West-Central Coastal Province (7203), West Africa" Bulleton 2207-B
Lithology Pattern:
Continental marl
Relationships and Distribution
Lower contact
Upper contact
Regional extent
GeoJSON
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[7.5,1],[6.5,0],[7.5,-1],[8.5,0],[7.5,1]]]]}}
Fossils
Age
Age Span:
Beginning stage:
Aptian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
117.30
Ending stage:
Albian
Fraction up in the ending stage:
0
Ending date (Ma):
113.20
Depositional setting
Depositional pattern:
Additional Information
long: 7.5 lat: 0
Compiler: