From The Far Side to The Flintstones to The New Yorker, the popular imagination puts the invention of the wheel back when dinosaurs roamed the earth. (Uphill both ways, in the snow, same 3rd grade teacher as your parents, etc.) The Paleolithic Era, the actual stone age, starts rougly 63 million years after the last of the Cretaceous dinosaurs. It spans 2.6 million years from when early hominids began to use stone tools to the end of the last ice age. But stone tools are not good for precise stone work, and did not advance much beyond hammers, axes or spears, and needles during this period. Stone wheels are out. The earliest wheels were almost definitely wood.
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