Texas - axis to what?

[johnnyvaldez7.jv]

This is an axis...dens and cranial articular surface showing.  Can't figure out if it's horse, cow or bison. I don't think it's cow because an image I saw had a notch or groove on the dens but maybe it had damage to it. My example also has the notch or groove on that cranial articular surface. 

Edited January 3, 2023 by johnnyvaldez7.jv

[johnnyvaldez7.jv]

Could this be bison?  It's roughly 4 inches across with the wear.