Devonian

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.