Large vertebrate discovered in northeast Alabama...or just a mirage?

[gladius]

My friend found what appears to be a large skeleton of some creature embedded in rock that was buried in red clay in a cave on Sand Mountain, in northeast Alabama. I took pictures of a number of different rocks which are rather unusual looking, nothing like I've seen before. They are a light weight, porous, mostly yellow rock with what appear to be pieces of bone sticking out of them. These three pieces pictured fit together perfectly and look a lot like some kind of shoulder joint. What do you guys think?

There's a whole cache of images here, of different rocks that came from this site: http://grow.game/files/fossil-pictures-lowres-2021-05-26.zip

 

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[seanz]

The piece on the far right looks like the upper part of a femur.

 

[Garscale]

Looks like three carpal bones. Part of a foot.