zonein TIMELINE Proterozoic Eon
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Period Subdivision Timespan
Proterozoic Eon Paleoproterozoic 1,000,000,000 to 542,000,000 years ago
Mesoproterozoic 16,000,000,000  to 1,000,000,000 years ago
Neoproterozoic 2,500,000,000 to 16,000,000,000 years ago