Atlantica (Greek: Ατλαντικα; Atlantika) is the name given to an ancient continent that formed during the Proterozoic about 2,000 million years ago (two billion years ago, Ga) from various 2 Ga cratons located in what is now West Africa and eastern South America. The name, introduced by Rogers 1996, was chosen because the continent opened up to form the South Atlantic Ocean.