Buba Shale Fm
Period:
Silurian
Age Interval:
Province:
Senegal Basin
Type Locality and Naming
Synonym: Buba Shale, Buba Fm
References: Brownfield and Charpentier, 2003
[Fig. 1. Generalized map of the central and southern parts of the Senegal Basin showing part of the Senegal Province, the Mauritania, Northern, and Casamance subbasins, the Mesozoic carbonate platform edge, the northern and southern salt basins, the Mauritanide Mountains, the Bové Basin, Deep Sea Drilling Project sites 367 and 368, the 2-second sediment isopach, and the onshore depth to basement isopachs (Brownfield and Charpentier, 2003)]
[Fig. 2: Generalized stratigraphic column for the Northern subbasin and the southern part of the Mauritania subbasins (Brownfield and Charpentier, 2003).]
Lithology and Thickness
The graptolite-bearing Buba Shale is about 400 m thick. It is a potential source rock in the Senegal Basin (Brownfield and Charpentier, 2003).
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
Gabu Sandstone Fm Fm (conformable)
Upper contact
Cusselinta Sandstone Fm (conformable)
Regional extent
Senegal Province, Mauritania, Senegal, The Gambia, and Guinea-Bissau, Northwest Africa
GeoJSON
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[-17.78,22.85],[-17.27,22.83],[-16.61,22.77],[-16.26,22.7],[-16.51,21.78],[-16.1,21.53],[-16.08,20.98],[-15.36,20.16],[-14.12,18.91],[-13.34,17.94],[-13.71,17.32],[-13.18,16.63],[-13.28,15.95],[-12.62,14.69],[-12.62,13.65],[-13.04,12.95],[-13.55,12.66],[-14.54,12.5],[-15.05,12.07],[-15.15,11.59],[-14.9,11.26],[-14.97,10.14],[-15.32,9],[-16.36,9.09],[-17.58,9.35],[-17.88,9.5],[-17.58,10.73],[-17.8,12.09],[-17.97,14.06],[-18.09,14.74],[-17.86,15.58],[-17.47,15.8],[-17.35,16.21],[-17.18,17.8],[-17.72,18.86],[-18.64,20.42],[-18.33,21.18],[-17.78,22.85]]]]}}
Fossils
Graptolites
Age
Generalized as Silurian in Brownfield and Charpentier (2003); but probably mainly early Silurian?
Age Span:
Beginning stage:
Rhuddanian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
443.07
Ending stage:
Pridoli
Fraction up in the ending stage:
1.0
Ending date (Ma):
419.00
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Enam O. Obiosio, Solomon Joshua Avong, Henry Nasir Suleiman, Rebecca Bobick (and Wen Du), modified from Brownfield, M.E. and Charpentier, R.R., 2003. "Assessment of the Undiscovered Oil and Gas of the Senegal Province, Mauritania, Senegal, The Gambia, and Guinea-Bissau, Northwest Africa", U.S. Geological Survey Bulletin 2207-A, 1-26.