Geology of Georgia
Geologic Time Scale. Source: Geologic Time Scale, Geological Society of America, 1999, from Boggs, 2006.. . Periods in this Chapter. From oldest to youngestLate OrdovicianOrdovician: 490 and 443 million years agoSilurian443 and 417 million years agoEarly DevonianDevonian: 417 and 354 million years ago.
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