Geological Time Scale

Click on a Period to find out more. Dates are in millions of years before present.

Cenozoic Era
(66 – 0 million years ago)
Quaternary (2.6 to present)
Neogene (23 – 2.6)
Palaeogene (66 – 23)
Mesozoic Era
(252 – 66 million years ago)
Cretaceous (145 – 66)
Jurassic (201 – 145)
Triassic (252- 201)
Palaeozoic Era
(541 – 252 million years ago)
Permian (299 – 252)
Carboniferous (359 – 299)
Devonian (419 – 359)
Silurian (444 – 419)
Ordovician (485-444)
Cambrian (541 – 485)
Precambrian (4,560 – 541 million years ago)