Two unknowns from the Potomac

[RCW3D]

This is posted in the fossil hunting trips as well, they were both found at Stratford Hall on the Potomac. The first I think is part of a turtle shell but that is just a guess. The second looked like a tooth when I found it sifting, but I honestly couldn't say for sure. I'd appreciate any help I can get in identifying these.

 

Thanks!

 

Unknown #1 - Bottom view

 

 

Top view

 

Side view.

 

 

Unknown #2

 

 

Looking in the end.

 

[Al Dente]

The first one might be part of a whale vert epiphysis but positive identification might not be possible.