Geology of Brazil
Archean (3,8 - 2,5 Ga)

During the Archean, molten material from the Earth's mantle was erupted by volcanoes and the first (micro) continents are supposed to have emerged out of a Hadean primeval ocean.

3 Ga Ur might have been the first assembly of these microcontinents followed by Arctica (2,5 Ga), Atlantica and Nena (1,8 Ga) during the Proterozoic.

Fragments of Archean continents can nowadays be found all over the world, among others in the Brazilian Atlantic Shield in the São Francisco Craton or the Mantiqueira Province.