Geographical Periods

Phanerozoic

Paleozoic

Cambrian

Ordovician

Silurian

Devonian

Carboniferous

Permian

Mesozoic

Triassic

Jurassic

Cretaceous

Cenozoic

Paleogene

paleocene

eocene

oligocene

Neogene

miocene

pliocene

pleistocene

holocene

Proterozoic

Archean

Hadean