From History: Lived from ~68 to 66.04 million years ago.
Triceratops, one of the last great horned dinosaurs, roamed western North America at the very end of the Age of Dinosaurs with its three horns, broad frill, and heavy four-legged build.
When you encounter a rational idea, first ask whether it is single-layered or multi-layered. Is it one step, or more than one step, away from its empirical ideas?