This cluster includes a number of Eurafrican and Mestico groups, as well as 1.2 million detribalized peoples in Nigeria.    From Wordnik.com.  [Survey of West Africa: Peoples Summarized] Reference

During the Pleistocene, the subtropical North Atlantic gyre was compressed, and a cold current ran along the Eurafrican coast to as far south as the Gambia.    From Wordnik.com.  [Archive 2006-01-01] Reference