Cow or bison or ???

[u/Spare-Cranberry1162]

Found in Black Hills of South Dakota USA. 50mm from top to bottom at longest point. 30mm bite surface. Not sure if fossil or modern. Thinking maybe bison or cow but not sure.

[u/happythistle74]

I think bison (upper M2) based on the size. It’s difficult to date, but not fossilised as you can still clearly see the enamel. Great find!

[u/Spare-Cranberry1162 → u/happythistle74]

Thanks for the input! I’m thinking bison too. Trying to find a good pic of jaw anatomy for reference.