Geologic Timescale

Era

Period

Epoch

started (millions of years ago)

Cenozoic

66.4 millions of years ago-present time

Quaternary

Holocene

0.01

Pleistocene

1.6

Tertiary

Neogene

Pliocene

5.3

Miocene

23.7

Paleogene

Oligocene

36.6

Eocene

57.8

Paleocene

66.4

Mesozoic

245-66.4 millions of years ago

Cretaceous

Late

97.5

Early

144

Jurassic

Late

163

Middle

187

Early

208

Triassic

Late

230

Middle

240

Early

245

Paleozoic

570-245 millions of years ago

Permian

Late

258

Early

286

Carboniferous

Pennsylvanian

Late

320

Mississippian

Early

360

Devonian

Late

374

Middle

387

Early

408

Silurian

Late

421

Early

438

Ordovician

Late

458

Middle

478

Early

505

Cambrian

Late

523

Middle

540

Early

570

Precambrian time

4500-570 millions of years ago

4500

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