Peace River Mammal Fossil ID Help Needed

[ColoradoRuss]

Hello all. I've tried and tried to get the ID on this on my own and just don't have the experience.  I dug this out of a gravel layer in the Peace River in Hardee County, Florida two weeks ago (early January, 2023).  Some of the contours seem like an astragalus (horse, camel, ...) but the more museum photos I see the less sure I am.  Thanks in advance for any information you are willing to share. The pics are a little overexposed (intentionally) to show the shape, so the color appears lighter in the pics than in reality.  Thanks!

[Harry Pristis]

Sorry, Russ . . . I've dealt with many, many bones from the Peace River, but I don't recognize this find.  If it is a common bone -- like an astragalus -- it is too worn to identify.

 

[Brandy Cole]

The base of the third picture reminds me of the articulation of a phalanx.

[Meganeura]

I’m gonna go against the grain here and say it looks like a vertebral process to me.

[Re-Elu]

Not familiar with this location, but second and fifth picture both remind me of a phalanx.