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Showing posts from December, 2021

Geologic Eras of Life: Not That Clear-Cut

Eras of Life, from PosterPlus (Sorry I don't know who the artist is) I always loved the "Prehistoric Life" picture books for kids, with their huge two-page spreads of each geological era. I used to lay on the floor, propped on my elbows as I read and re-read my favorites: the Cretaceous, of course, when dinosaurs really got down to the business of being gigantic war-lizards; the Pleistocene, with its ice ages and giant twisty-horned/tusked/toothed shag-carpeted megabeasts; Oligocene South America, which warranted its own page due to the weirdness of its fantastic critters: bus-sized sloths, giant killer chickens, "camels" with elephant trunks and unpronounceable names, sabertooth cats that were actually marsupials but not really. The Progression of Life was very simple, like a chapterbook - first came the rather boring Precambrian (jellyfish and sea-pens, yadda yadda...) then the CAMBRIAN EXPLOSION! followed swiftly by the Ages of Fish, Amphibians, Mammal-Like R