Hi,
Was just checking our favourite auction site for fossils and i came across this. It is interesting because the seller has it listed as a Pteranodon wing bone from the Hell Creek Formation (in Montana), yet this seems odd because Pteranodon has not been described from the Hell Creek Formation and existed at a different time (around 85 mya), so this makes me skeptical whether this bone is pterosaur or possibly from something else like a theropod (the bone is 9 inches long). Any opinions if it is pterosaur or not, the pictures are a bit hard to tell by. Thanks.