Era
Ordovician
22
Devonian
11
Cambrian
7
From 345 to 405 million years ago
7
Dévonien
6
Pleistocene
6
From 425 to 500 million years ago
5
Ordovicien
5
Paleozoic
4
From 10 thousand to 2 million years ago
3
Pléistocène
3
Cambrien
2
From 230 to 570 million years ago
2
Paléozoïque
2
Carboniferous
1
Carbonifère
1
From 280 to 345 million years ago
1
From 425 to 570 million years ago
1
From 500 to 570 million years ago
1