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Hi, This one is a real kicker for me and I'm eager to hear what you think. Before studying it, I thought it might be a small T Rex, but the serrations are too fine. I don't believe it can be Nano for a few reasons, base shape being a big one (zero pinch). But it'd be unusual for a DR I think too, mostly for the mesial carina, but not sure. I wonder if much of the oddity is due to it possibly being an anterior tooth...? It's: From the hell creek formation CH: 16.6mm CBL: 8.8mm (1.88 ratio) Mesial serration density: about 6 per MM Distal serration density: about 4 per MM Serration shape: Hard to tell with the level of wear, but the stumps are perfectly round--not boxy or rectrangular, as I'd expect if chisel Base cross-section: Oval, no pinch whatsoever Mesial carina: Here's a tough part--it's very offset to one side and it hard for me to tell whether that means twist or not. Both the distal and mesial carina are fairly extremely to opposite sides (anterior?). So the mesial can look like it has twist, but, from the right sideways view, the two carina are both visible and parallel from top to bottom--they don't seem to converge with a twist at the lower mesial portion. THANK YOU!