Unknown Pleistocene bone from Jax

[Megajax]

I found an unidentified fossil on the beach here in Ponte Vedra, just south of Jacksonville.   Previously I have found other Ice Age mammal bones and teeth, including a Glyptodont scute, a horse tooth and part of a mammoth tusk as well as fish and reptile material. I’m no anatomist but  based on the bilateral symmetry this looks to me like it comes from the spine or tail of something.   Actually I’m put in mind of the bony knob on the end of the tail of an Ankylosaur, though I’m obviously not suggesting it is that.   Can anyone weigh in?  Thanks in advance...u

[Megajax]

Posting more to follow due to upload size limits:

[Megajax]

And another:

[Megajax]

Correcting my omission error, here’s a measurement:

[Rockwood]

Worn centrum from a large vertebra would seem like a reasonable guess.

[Megajax]

Thanks for that, is there no way to narrow it down to a specific species?