


Geology of Brazil
Precambrian (4,5 Ga - 542 Ma)

At the end of this age, the prototypes of South America (the South American Platform) and Africa were formed. At the end of the Brasiliano - Pan African orogenic cycle both constitute the western part of supercontinent Gondwana.
During the Precambrian, the first primeval life - forms, so - called stromatolites were formed. These microorganisms were responsible for the atmosphere's oxygen which they created by photosynthesis out of the sunlight. The oldest fossilized stromatolites (3,5 Ga) were found recently in the Warrawoona Group, in Australia. In 1944, Collenia itapevensis, the first South American fossil of proven Precambrian age, was found in the carbonatic rocks of the Itaioca Group at Serra de Paranapiacaba (São Paulo State) – Geological Travel / Brazil.