The Standard Geologic Column and Time Scale

© Robert E. Gentet 2015

Eras

Systems (of Rocks)
Periods (of Time)

Series (of Rocks)
Epochs (of Time)

Millions of Years
(Standard Geologic Time)

0 - 1.5

1.5 - 65

65 - 245

245 - 500

Recent
Pleistocene

Tertiary

Pliocene
Miocene
Oligocene
Eocene
Paleocene

Devonian
Silurian
Ordovician
Cambrian

Cenozoic

500 - 4600

Cretaceous
Jurassic
Triassic

Permian

Pennsylvanian
Mississippian

Carboniferous Systems

Mesozoic

Paleozoic

Precambrian

Quaternary