No More Brontosaurus

There was a mistake with Brontosaurus. There was a story that a scientist found bones of a huge long-necked dinosaur named Brontosaurus. Later the same scientist found the bones of another long-necked dinosaur named Apatosaurus. In 1903 another scientist named Elmer Riggs looked at both skeletons and he realised that Brontosaurus had the body of a Apatosaurus and the head of a Camarasaurus head. WHAT A MIX UP!
But another mistake with ALL dinosaurs...there tails were dragging! All scientist say that dinosaurs tails were held up because when dinosaurs walked near a base of water the sand and mud mix together they make fossilised foot prints. If dinosaurs did drag their tails they would have been fossilised.