Bison alticornis

[pss1nw@surrey.ac.uk (Nigel Woodger)]

Would I be correct in thinking that this beast was originaly named from a 
single horn which had been disturbed and was found in sediments much younger 
than those in which it had been originaly fossilized-this led Marsh to 
belive it could not be a dinosaur. He identified it as a species of extinct 
bison-hence the name-I belive the animal turned out to be a horned dinosaur.
Anyone know if this is correct?
Spike