The CBTH-Phase IV proposed study area is shown in the large boxed areas. The CBTH-Phase IV area includes the
oil-rich areas of the Mexican and US sectors of the Gulf of Mexico, the Caribbean, and northern South America, as well
as the equatorial, conjugate margins of Guyana, Suriname, French Guyana, Brazil along with countries in west Africa
(Western Sahara, Mauritania, Senegal, The Gambia, Guinea-Bissau, Guinea, Sierra Leone, Liberia, Cote d’Ivoire, Ghana,
Togo, Benin, Nigeria, Cameroon, Equatorial Guinea, Gabon, Congo, and Angola.
Numbers on map refer to areas of proposed work described in the text of the Phase IV proposal: 1 = Trinidad
region; 2 = Suriname and French Guyana; 3 = equatorial basins of northern Brazil; 4 = northern Andean foreland basins; 5 =
Nicaraguan Rise; 6 = Mexican sector of the Gulf of Mexico; 7 = onland basins of Colombia; 8 = Suriname and French Guyana;
9 = equatorial basins of northern Brazil; 10 = Mauritania; 11 = various countries of equatorial west Africa.