Fossil Friday!

This week’s Fossil Friday comes to you straight from the middle Eocene. This is a photo of a lower jaw found in what is now Sweetwater County, Wyoming. This fellow’s family has been mistaken for the tapir’s family, and though it does share an early ancestor, I can assure you it is different. 

This will be a true test of your tooth-knowledge. How much can you tell from just this lower jaw?  Can you guess what this fossil is?