Is this a Fossilized Rib Bone?

[Bigcypresshunter]

This was found some years ago in road fill dug from a rock pit in South Florida years ago. Rock and shell dug from these pits are used to make roads. Its hard as a rock, smooth on the outside and has layers inside. Is this a fossilized rib bone or something else?

 

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[Bigcypresshunter]

Piece of a rib bone?

View attachment 1193783

Fossilized rib bone. That was my first thought but people are telling me its more likely a tooth. thanks Charlie

 

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[Bigcypresshunter]

close up pic of the layering and cleavage. I have not seen this in a shell. Even crispen says its not a bone.

 

[Charlie P. (NY)]

Multiple layers of plaster? The edge-on shot of layers are too thick for shell or bone. But the second image appears to show voids from small bubbles.

 

[Bigcypresshunter]

Multiple layers of plaster? The edge-on shot of layers are too thick for shell or bone. But the second image appears to show voids from small bubbles.

The layers seem hard but I just tried and I can nick it with my knife. But I dont think its plaster but its not as hard as I thought it would be. Its not as hard as tooth enamel.


Well its definitely not bone but we are thinking fossilized mineralized bone. It looks and feels like a rock except one side is smooth. Its dense and heavy.

 

[Bigcypresshunter]

Maybe it is some kind of concrete/ plaster ring. There was a lot of that home made shell mix concrete laying around that the old timers used to use for concrete. I think they call it tabby. Not sure. https://en.wikipedia.org/wiki/Tabby_concrete