Phanerozoic (543 mya to today)

Paleozoic Era (543 to 248 mya)
Cambrian (543 to 490 mya)

Tommotian (530 to 527 mya)
Ordovician (490 to 443 mya)
Silurian (443 to 417 mya)
Devonian (417 to 354 mya)
Carboniferous (354 to 2290 mya)

Mississippian (354 to 323 mya)
Pennsylvanian (323 to 290 mya)
Permian (290 to 248 mya)


Mesozoic Era (248 to 65 mya)

Triassic (248 to 206 mya)
Jurassic (206 to 144 mya)
Cretaceous (144 to 65 mya)


Cenozoic Era (65 mya to today)

Tertiary (65 to 1.8 mya)

Paleocene (65 to 54.8 mya)
Eocene 54.8 to 33.7 mya)
Oligocene (33.7 to 23.8 mya)
Miocene (23.8 to 5.3 mya)
Pliocene (5.3 to 1.8 mya)

Quaternary (1.8 mya to today)

Pleistocene (1.8 mya to 10,000 years ago)
Holocene (10,000 years ago to today)