|
Name of Period
|
Age
|
|
Formation of earth
|
estimated to have occurred 4.5 billion years ago
|
|
Cambrian
|
550-500 million years ago
|
|
Ordovician
|
500-440 million years ago
|
|
Silurian
|
440-405 million years ago
|
|
Devonian
|
405-370 million years ago
|
|
Carboniferous
|
370-290 million years ago
|
|
Permian
|
290-250 million years ago
|
|
Triassic
|
250-205 million years ago
|
|
Jurassic
|
205-135 million years ago
|
|
Cretaceous
|
135-65 million years ago
|
|
Tertiary
|
65 million years ago-today
|
Geological Periods