Many Earth scientists are parents of young children, most of whom are no doubt familiar with the children's television character Barney the Dinosaur and his rendition of the names of the days of the week, sung to the tune of “Clementine.”
Geologist parents should note the following fortuitous occurrences. First, the Paleozoic is divided into seven periods, Cambrian through Permian (the Carboniferous is counted here as two, Mississippian and Pennsylvanian). Second, the Cenozoic is divided into seven epochs, Paleocene through Holocene. Therefore one may sing the “Sunday, Monday…” song substituting for the days of the week the names of the periods and epochs.