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age of the earth
4.567 Ga
base of the paleozoic (year)
541
base of the mesozoic (year)
252
base of cenozoic (year)
66
Paleozoic =
Cambrian, Ordovician, Silutian, Devonian, Carboniferous, Permian
Precambrian =
archean, proterozoic
Mesozoic =
Triassic, Jurassic, Cretaceous
Cenozoic =
paleogene, neogene
acronym for smaller labels ambogst Paleozoic and Mesozoic (middle)
Camels often sit down carefully, petimrhaps their joints creak
timeline of large age labels (mnemonic)
pretty pickles, messy cucumbers