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SenegalBasin LateCret Formation

SenegalBasin LateCret Fm

Period:

Cretaceous

Age Interval:

Coniacian-Maastrichtian

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 Coniacian through Maastrichtian consists of a general regressive trend through the Coniacian-Santonian (300 to 1000 m) in which sand-rich sediments reach their furthest westward advance into the Senegal Basin; then a general transgressive trend through the Campanian (100 to 400 m), and a general regressive trend through the Maastrichtian (800 to 1250 m). Throughout these T-R trends, the distal basin to the west accumulates clay-rich marls; whereas the proximal eastern shelf are deposits of sands.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

It conformably overlies the SenegalBasin Turonian Fm

Upper contact

It is conformably overlain by the SenegalBasin Paleogene Fm

Regional extent

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

GeoJSON

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Fossils

Age

Coniacian-Maastrichtian

Age Span:

Beginning stage:

Coniacian

Fraction up in beginning stage:

0.00

Beginning date (Ma):

89.39

Ending stage:

Maastrichtian

Fraction up in the ending stage:

1.0

Ending date (Ma):

66.04

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.