When I went to geology school, I was already so advanced that I never used mnemonicsthose anagram sentences that help students keep track of the names of the geologic time periods. A reader in the Forum has been using the good old sentence "camels often sit down carefully, perhaps their joints creak terribly" to remember the sequence Cambrian-Ordovician-Silurian-Devonian-Carboniferous-Permian-Triassic-Jurassic-Cretaceous-Tertiary. That marks her as both (1) a UK resident and (2) a bit behind the times. On the first point, American students memorize Mississippian and Pennsylvanian instead of the Carboniferous (although that puts us behind the times). On the second, the Tertiary period has been deprecated by the geologic time authorities (although many still find it useful) while the Quaternary period has been formalized. So the perfect mnemonic should end with three words after "creak" to mark the Paleogene, Neogene and Quaternary periods.
What would you use? All I can think of is "creak painfully, no? quite." And where should the Anthropocene go?