zonein TIMELINE Paleozoic Era
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Period Subdivision Timespan
Paleozoic Era Permian 299,000,000 to 251,000,000 years ago
Carboniferous 359,200,000 to 299,000,000 years ago
Devonian 416,000,000 to 359,200,000 years ago
Silurian 443,700,000 to 416,000,000 years ago
Ordovician 488,300,000 to 443,700,000 years ago
Cambrian 542,000,000 to 488,300,000  years ago