West Africa territory in the south Atlantic Ocean. In the United Nations scheme of African regions, the region includes 17 states and the island of Saint Helena, an overseas territory: Mali, Burkina Faso, Senegal and Niger are mostly in the Sahel, a transition zone between the Sahara desert and the Sudanian Savanna, Benin, Cote d'Ivoire, Gambia, Ghana, Guinea, Guinea-Bissau, Liberia, Sierra Leone, Togo, and Nigeria compose Guinea, the traditional name for the area near the Gulf of Guinea, Cape Verde is an island country in the Atlantic Ocean, Mauritania lies in the Maghreb, the northwestern region of Africa that has historically been
Geology of Liberia Geology of Liberia The geology of Liberia is largely extremely ancient rock formed between 3.5 billion and 541 million years ago in the Archean and the Neoproterozoic, with some rocks from the past 145 million years near the coast. The country has rich iron resources as well as some diamonds, gold and other minerals in ancient sediment formations weathered to higher concentrations by tropical rainfall. Two billion to 1.6 billion year old Archean and Paleoproterozoic underlie 90% of Liberia, forming the Man Shield, part of the West African Craton—a region of stable continental crust leftover from early continent formation. The