EON
ERA
PERIOD
QUATERNARY
EPOCH +AGE Ma
HOLOCENE
.01171 Ma
PLEISTOCENE
2.58 Ma
NEOGENE
CENOZOIC
23.03 Ma
MIOCENE
OLIGOCENE
EOCENE
PALEOCENE
66 Ma
CRETACEOUS
145 Ma
MESOZOIC
JURASSIC
TRIASSIC
PERMIAN
PALEOZOIC
CARBONIFEROUS
PHANEROZOIC
PALEOGENE
PLIOCENE
201.3 Ma
251.902 Ma
298.9 Ma
PENNSYLVANIAN
323.2 Ma
MISSISSIPPIAN
subperiod
358.9 Ma
DEVONIAN
419 Ma
SILURIAN
444 Ma
ORDOVICIAN
485 Ma
PROTEROZOIC
ARCHEAN
PRECAMBRIAN
CAMBRIAN
Neoproterozoic
Ediacaran
Cryogenian
Mesoproterozoic
Paleoproterozoic
Neoarchean
2500 Ma
Mesoarchean
Paleoarchean
Eoarchean
HADEAN
4000 Ma
~4600 Ma
541 Ma
635 Ma
720 Ma