zonein TIMELINE Mesoproterozoic
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Period Subdivision Timespan
Mesoproterozoic Stenian 1,200,000,000 to 1,000,000,000 years ago
Ectasian 1,400,000,000  to 1,200,000,000 years ago
Calymmian 1,600,000,000 to 1,400,000,000 years ago