Mammal (?) tooth

[Largemouth Bass]

Looking for a possible ID of this tooth fragment. It is almost 1 inch (2.5 cm) in length.

[jpc]

Half of a lower molar.  Can we see a view of the chewing surface, and can you tell us where it is from.  Geological age is pretty important in mammal tooth ID.  

[Largemouth Bass]

It is from the VA side of the Potomac River, coming from the Calvert Formation. 

[Meganeura]

36 minutes ago, Largemouth Bass said:

It is from the VA side of the Potomac River, coming from the Calvert Formation. 

Well it's certainly not cetacean! Amphicyon fossils are present in the Calvert Formation, and this reminds me of a bear/bear-dog molar piece (I found a similarly broken tooth fragment here in Florida that Richard Hulbert ID'd as bear or bear-dog) - so that's my leaning. 

[Harry Pristis]

Bear (Ursid) and bear dog (Amphicyonid) teeth are very different in conformation.  Amphicyonid teeth are quite canid-like and quite unlike ursid teeth.

 

That said, why can't we get a full-on view of the occlusal surface of this tooth fragment?  Like this:

 

[Largemouth Bass]

[Harry Pristis]

1 hour ago, Largemouth Bass said:

Sorry, I just cannot connect this image with the earlier images.

[Meganeura]

30 minutes ago, Harry Pristis said:

Sorry, I just cannot connect this image with the earlier images.

it's been flipped upside down compared to this image:

[jpc]

tough call... I am happy calling it a lower molar of a mammal.  There is a lot missing.