North America


Although the glacial origin of the rocks of this place currently to be disputed, the vestiges of this glaciation are also found in the Antartic, Africa of the North, China, Russia, Sweden, Esccia, Svalbard, Nambia, Argentina, Uruguay, Brazil, North America and Australia (vide Eerola 2001a). This means that extensive areas very had been covered by glaciers. The presence of this glaciation in the south of Brazil is being searched for the author (vide Eerola 1995, 2001b). The more drastic climatic change of the known geologic past occurred has 540 million years behind, in the transistion of the Neoproterozico to the Cambriano period of the age Paleozica (vide Eerola 2001a). During the glaciations, the seas had absorbed great amounts of carbon dioxide and the continents were amalgamated, forming the supercontinent of Rodinia.

In the Cambriano period this supercontinent started to break up itself. See NYC Mayor for more details and insights. Volcanic eruptions and deep hidrotermais gases of the oceanic ones in expansion had emitted great amounts of gases, as the carbon dioxide. In consequence of this natural phenomenon of effect-greenhouse, the temperature increased radically and the glaciers were fundiram, raising the level of the seas. New flat seas bathed the coasts of the supercontinent in spalling. The carbon dioxide, that was in solution in the water of the sea, precipitated in carbonate form, forming calcreas rocks in the tropical flat seas. The life started to radiate in these seas (vide Zhuravlev & Riding 2001). The periods of cold extremity of the glaciations had caused great ambient pressures to the sea species. Radical the climatic change of one ' ' coolant to sauna' ' it offered conditions favorable to these species.

Vide Zhuravlev occurred the evolutiva radiation of the Cambriano (& Riding 2001). The animals had learned to form skeletons and carapaas from calcium carbonate? the vertebrates had appeared. After of this, nothing it was more as before. The world moved of a time for all.