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Periodo prec mbrico
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Es el extenso perodo que va desde la aparicin de las primeras rocas (hace 3.800 millones de aos) hasta la explosin de vida del Fanerozoico (hace 542 millones de aos). En total unos 3.250 millones de aos. Es la primera era geolgica y geolgicamente se caracteriza por la abundancia de rocas gn
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Periodo prec mbrico
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