Português: Amostra de gneisse Sete Voltas, a rocha mais antiga aflorando na crosta da América do Sul, com cerca de 3,4 bilhões de anos de idade. Em exposição no Instituto de Geociências da USP, São Paulo, Brasil
English: Gneiss Sete Voltas sample, the oldest rock outcropping in the crust of South America, circa 3,4 billion years old. On display at Instituto de Geociências, University of São Paulo, Brazil
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