Summerville area creek mystery fossil

[fossil_lover_2277]

Anyone have any idea what this is? Found it in a creek just outside the town of Summerville. It’s definitely a fossil, it has an internal histology. The back part extended longer before it broke digging it out (it’s incredibly fragile). I’m thinking it might be some type of fossil coral, otherwise I have no idea, even with researching it online. I found it next to some associated pieces of a sea turtle shell in a lag deposit, lots of phosphate nodules surrounding it. Very brittle, just like the sea turtle shell, and of the same color as the turtle shell. Weird.

[fossil_lover_2277]

Okay so a paleontologist confirmed it’s likely part of the sea turtle, either a bone, maybe a rib, or part of the shell (which yes is technically bone). If anyone is an expert in sea turtles, would you happen to know what part this might be from? Thanks!