Earth Science: Geologic Age

Table 1: Eons and Eras of geologic time
Eon Era Beginning of Era (MA)
Phanerozoic Cenozoic 66
Mesozoic 245
Paleozoic 570
Proterozoic Late 900
Middle 1600
Early 2500
Archean Late 3000
Middle 3400
Early 3900 (?)
(Earth formation) 4550

Table 2: Eras, Periods, and Epochs of Phanerozoic time
Era Period Epoch Beginning of Era (MA)
Cenozoic Quaternary Holocene 0.01
Pleistocene 1.7
Tertiary Pliocene 5
Miocene 24
Oligocene 37
Eocene 58
Paleocene 66
Mesozoic Cretaceous 144
Jurassic 208
Triassic 245
Paleozoic Permian 286
Carboniferous (Pennsylvanian) 320
Carboniferous (Mississippian) 360
Devonian 408
Silurian 438
Ordivician 505
Cambrian 570


Last modified: Tue Apr 24 10:27:30 CDT 2001