Mnemonic Device:

• “Could Oil Stop Driving Cars?” Plus, “Tires Jam Cars Through Quakes.”

Explanation: to remember these geological time periods

• Paleozoic
  • Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian
• Mesozoic
  • Triassic, Jurassic, Cretaceous
• K-T extinction
  • Cretaceous-Tertiary
• Current time period
  • Quaternary