Era
Quaternary
36
From 2 million years ago
26
Precambrian
19
Silurian
16
From 570 million to 5 billion years ago
13
Ordovician
12
Paleozoic
10
Cretaceous
9
From 405 to 425 million years ago
9
Jurassic
8
Pleistocene
7
Cambrian
6
From 425 to 500 million years ago
6
Holocene
6
Proterozoic
6
From 10 thousand to 2 million years ago
5
From 140 to 190 million years ago
5
From 65 to 140 million years ago
5
19th century
4
From 570 million to 2 billion years ago
4
1712-1772
3
Archaean
3
From 230 to 570 million years ago
3
Mesozoic
3
20th century
2
Carboniferous
2
From 10 thousand years ago
2
From 280 to 345 million years ago
2
From 500 to 570 million years ago
2
From 65 to 190 million years ago
2
Pre-Quaternary
2
Tertiary
2
1800-1999
1
Devonian
1
Eocene
1
From 140 to 230 million years ago
1
From 2 to 5 billion years ago
1
From 2 to 570 million years ago
1
From 2 to 65 million years ago
1
From 40 to 140 million years ago
1
From 405 to 500 million years ago
1
From 425 to 570 million years ago
1
From 65 to 230 million years ago
1
Triassic
1