For some students in North America, the first geology lesson is about poker. For others, it focuses on pearls. My British geology teacher opted to talk about camels. In all three cases, the idea is to make sure the students learn the main geological divisions of the last half a billion years or so – Cambrian, Ordovician, Silurian, and so on. The details vary, but the method of choice is the same: a mnemonic.
Come over some day, maybe play poker. Three jacks can take queens.
Cold oysters seldom develop many precious pearls, their juices congeal too quickly.
In the UK, where the geological divisions chosen are slightly different, the mnemonics run something like this: Camels often sit down carefully. Perhaps their joints creak? Early oiling might prevent permanent rheumatism.