In 1878, paleontologist Edward Drinker Cope discovered the partial vertebra of a new species of dinosaur near Morrison, Colo. It was in poor condition but enormous, 7.8 feet high.

If it really existed, that would make Amphicoelias fragillimus the largest dinosaur ever discovered, up to 200 feet long and weighing as much as 185 tons, the equivalent of a land-dwelling blue whale.

Cope packed up the vertebra and sent it by train to a New York museum, but apparently it crumbled into dust on the way. All that remain are Cope’s description and a line drawing. Oh well.