Geologic Time Scale: a record of the life forms and geologic events in Earth's history.

Cenozoic

• Quaternary
• Tertiary

Mesozoic

• Cretaceous
• Jurassic
• Triassic

Paleozoic

• Permian
• Carboniferous
• Devonian
• Silurian
• Ordovician
• Cambrian

Precambrian