Skull, Teeth, Jawbone, etc.

[MrIowan]

Hello everyone and thanks in advance for any help or ideas. Earlier this summer my friend moved to South Dakota and purchased a home. A few days ago he was cleaning out a shed on the property and found a cardboard box filled with the fossils seen below. It is unknown if the prior owner had found these on the property or if they had been purchased elsewhere. So unfortunately he has no idea where or when these were originally found. Neither of us have much experience in this but obviously fossils such as these catch your attention! If anyone wants or needs additional pictures let me know and I will see if he can send more. I have included mostly pictures of the skull and teeth as I figured they would likely be most helpful for identification. It is assumed all these pieces belong together but it is possible it is just a random collection. The pictures in order are: skull facing front, skull bottom, skull side (close up), three different angles of the jaw/teeth, and then one pic of all the pieces together with a ruler to get a ballpark idea of sizing. Hope you guys enjoy the pics and hopefully someone out there has some guesses. Thanks!

[PaleoNoel]

Oreodont skull and jaw section, below looks like tortoise shell

[Randyw]

+1 oreodont

I suspect Merycoidodon culbertsoni. Should be nice if someone finishes prepping it