Era
Paleozoic
21
Precambrian
15
Cretaceous
13
Carboniferous
12
Devonian
12
Quaternary
12
Mesozoic
10
Ordovician
10
Pennsylvanian
10
Cambrian
8
Mississippian
7
Pleistocene
7
20th century
6
Cenozoic
6
Permian
6
Proterozoic
6
Silurian
6
Tertiary
6
From 280 to 345 million years ago
5
19th century
4
Holocene
4
Pennsylvanien
4
21st century
3
Permien
3
Crétacé
2
From 230 to 280 million years ago
2
From 65 to 140 million years ago
2
Paleogene
2
Paléozoïque
2
Précambrien
2
Triassic
2
1776-1842
1
1793-1864
1
1867
1
1876
1
1900-1999
1
1920-
1
1935-
1
2000-2022
1
2000-2099
1
Archaean
1
Archéen
1
Carbonifère
1
Cénozoïque
1
Confederation, 1867
1
From 10 thousand to 2 million years ago
1
From 230 million to 5 billion years ago
1
From 230 to 310 million years ago
1
From 230 to 570 million years ago
1
From 280 to 310 million years ago
1
more ...