Permian- 290 to 245 million years ago
Carboniferous- 352 to 290 million years ago
Devonian- 408 to 352 million years ago
Silurian- 440 to 408 million years ago
Ordovician- 510 to 440 million years ago
Cambrian- 550 to 510 million years ago
Pre-Cambrian- 553 to 550 million years ago