ERA

PERIOD

EPOCH

MILLION YEARS AGO

Cenozoic

Quaternary

Holocene

Present - 0.01

Pleistocene (Ice Age)

0.01 - 1.8

 Tertiary

Pliocene

1.8 - 5

Miocene

5 - 22.5

Oligocene

22.5 - 38

Eocene

38 - 54

Paleocene

54 - 65

Mesozoic

Cretaceous

Upper

65 -

Lower

     -141

Jurassic

141 -195

Triassic

195 - 230

Paleozoic

Permian

230 - 280

Pennsylvanian

280 - 310

Mississippian

310 - 345

Devonian

345 - 395

Silurian

395 - 435

Ordovician

 435 - 500

Cambrian

500 - 570

Pre-Cambrian

570 -