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Here are two links to posts dealing with how to post pictures on Black River Fossils forums.
1. How to Post Pictures on Black River Fossils Forums by ditchweezil
2. How to Post Pictures on Black River Fossils Forums by Daryl
Bears have molars that look somewhat like human molars, flat with bumps on the top, but they are much longer than human molars. Your jaw looks like it is from Bos taurus, better known as a cow.