Geologic Time Scale

Precambrian → Hadean Eon

>4000 Ma

Precambrain → Archean Eon

4000 Ma - 2500 Ma

Precambrian → Proterozoic Eon

2500 Ma - 541 Ma

Proterozoic Eon → Paleoproterozoic Era

2500 - 1600 Ma

Proterozoic Eon → Mesoproterozoic Era

1600 Ma - 1000 Ma

Proterozoic → Neoproterozoic Era

1000 - 541 Ma

Neoproterozoic Era → Cryogenian Period

720 - 635 Ma

Neoproterozoic Era → Ediacaran Period

635 - 538 Ma

Neoproterozoic Era → Tonian Period

1000 - 720 Ma

Phanerozoic Eon → Paleozoic Era

538 - 358 Ma

Paleozoic Era → Cambrian Period

538 - 529 Ma

Paleozoic Era → Ordovician Period

485 - 443 Ma

Paleozoic Era → Silurian Period

443 - 419 Ma

Paleozoic Era → Devonian Period

419 - 358 Ma

Paleozoic Era → Carboniferous Period ( Mississippian/ Pennsylvanian)

359 - 303 Ma

Paleozoic Era → Permian Period

299 - 251 Ma

Phanerozoic Eon → Mesozoic Era

251 - 66 Ma

Mesozoic Era → Triassic Period

252- 201 Ma

Mesozoic Era → Jurassic Period

201 - 145 Ma

Mesozoic Era → Cretaceous Period

145 - 66 Ma

Phanerozoic → Cenozoic Era

66 Ma - Present

Cenozoic Era → Paleogene Period

66 - 23 Ma

Cenozoic Era → Neogene Period

23 -5 Ma

Cenozoic Era → Quaternary Period

2.6 Ma - present

Paleogene Period → Paleocene Epoch

66 -56 Ma

Paleogene Period → Eocene Epoch

56 - 33 Ma

Paleogene Period → Oligocene Epoch

33.9 - 23 Ma

Neogene Period → Miocene Epoch

23 - 5.3 Ma

Neogene Period → Pliocene Epoch

5.3 - 3.6 Ma

Quaternary Period → Pleistocene Epoch

2.58 - 0.0117 Ma

Quaternary Period → Holocene Epoch

0.0082 Ma - present