Mnemonic for remembering the geological timescale

The periods of the geological timescale are:

• Cambrian, Ordovician, Silurian, Devonian, Carboniferous;
• Permian, Triassic, Jurassic, Cretaceous;
• Palaeocene, Eocene, Oligocene, Miocene, Pilocene, Pleistocene, Holocene.

The Mnemonic is

• Camels Often Sit Down Carefully.
• Perhaps Their Joints Creak.
• Probably Early Oiling Might Prevent Premature Harm.