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Hey there @d-n! Can you give me a little more information (where it’s from and if you know the age)? That could help. At the moment it’s hard for me to tell if I’m looking at a rock or a fossil.

Eastern Oklahoma near Arkansas border in the entrance to an old cave opening in the side of a bluff. Have no idea of the age as I just found it. Has a greenish coloration on the section with ridges, could be oxidation or could be mold. I have only found small fossils, largest was a small fish. Typically have only found fossils in another location nearby at higher elevation.

Looks like a hunk of coprolite

Does it appear to contain vertebrae? There are three more pictures from each side posted

Looks like a coprolite to me, too.