Geological Time Scale

EraPeriodMillion Years Ago
Cenozoic Quaternary0-2
Tertiary2-66
Mesozoic Cretaceous66-144
Jurassic144-208
Triassic208-245
Paleozoic Permian245-286
Carboniferous 286-360
Devonian 360-408
Silurian 408-438
Ordovician 438-505
Cambrian 505-570
Precambrian - 4600-570
Notice that this timeline is not to scale: for example, the Precambrian Era is longer than all the rest of the time together.