thumb|Atlantica at about 2 Ga. Archean cratons in grey.
Atlantica (; Atlantika) is an ancient continent that formed during the Proterozoic about (two billion years ago, Ga) from various 2 Ga cratons located in what are now West Africa and eastern South America.
The name, introduced by John Rogers in 1996,
Formation
Atlantica formed simultaneously with Nena at about 1.9 Ga from Archaean cratons, including Amazonia in present-day South America, and the Congo, West Africa and North Africa Cratons in Africa.
Breakup
thumb|Reconstruction of Earth 550 Ma ago showing the cratons of Atlantica forming West Gondwana
Atlantica separated from Nena between 1.6–1.4 Ga when Columbia — a supercontinent composed of Ur, Nena, and Atlantica — fragmented.
See also
- Plate tectonics