Cambrian

Ordovician

Silurian

Devonian

Mississippian

Pennsylvanian

Permian

Triassic

Jurassic

Cretaceous

Paleogene

Neogene

Carboniferous

MES

OZO

ICC

ENO

-ZO

IC

P

H

A

N

E

R

O

Z

O

I

C

PALE

OZO

IC

Phanerozoic

Proterozoic

Archean

4000 Ma

2500 Ma

541 Ma

252 Ma

66 Ma

Quaternary

485 Ma

444 Ma

419 Ma

359 Ma

323 Ma299 Ma

201 Ma

145 Ma

23 Ma2.58 Ma

541 Ma

Eon Era PeriodEon

Cambrian

Ordovician

Silurian

Devonian

Mississippian

Pennsylvanian

Permian

Triassic

Jurassic

Cretaceous

Paleogene

Neogene

Carboniferous

MES

OZO

ICC

ENO

-ZO

IC

P

H

A

N

E

R

O

Z

O

I

C

PALE

OZO

IC

Quaternary

C

E N

O

Z

O

I C

Paleogene

Neogene

Quaternary

66 Ma

23 Ma

Paleocene

Eocene

Oligocene

Miocene

PliocenePleistocene

Holocene

2.58 Ma

Eon Era Period Era Period Epoch

56 Ma

34 Ma

5.3 Ma

Last 11,700 yrs