Evolutionary Geologic Column

ERA

PERIOD

AGE (Millions)

CENOZOIC

QUATERNARY

Beginning of period

Recent

The Age of

Pleistocene

2

Mammals

TERTIARY

Pliocene

5

Miocene

24

Oligocene

34

Eocene

55

Paleocene

65

MESOZOIC

CRETACEOUS

140

The Age of

JURASSIC

200

Dinosaurs

TRIASSIC

251

PALEOZOIC

PERMIAN

290

CARBONIFEROUS

The Age of

Pennsylvanian

315

Trilobites

Mississippian

355

DEVONIAN

405

SILURIAN

440

ORDOVICIAN

500

CAMBRIAN

545

PRECAMBRIAN

4500