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SenegalBasin Miocene Formation

SenegalBasin Miocene Fm

Period:

Neogene

Age Interval:

Aquitanian – Messinian

Province:
Senegal Basin

Type Locality and Naming

This is only an INFORMAL NAME to enable a Lexicon entry.

Diana-Malari (DM–1) and Kolda (KO–1) wells (Brownfield and Charpentier, 2013).

Synonym:

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 terminal 30-200m thick Miocene Fm is made up entirely of shaly sandstones (Brownfield and Charpentier, 2003).

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

It unconformably overlies the SenegalBasin Paleogene Fm. The Oligocene is absent.

Upper contact

Surface of the Subbasins

Regional extent

Senegal, Mauritania, Senegal, The Gambia, and Guinea-Bissau, Northwest Africa

GeoJSON

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Fossils

Age

Miocene

Age Span:

Beginning stage:

Aquitanian

Fraction up in beginning stage:

0.00

Beginning date (Ma):

23.04

Ending stage:

Messinian

Fraction up in the ending stage:

1.0

Ending date (Ma):

5.34

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.