Hey! I need help identifying this... fossil? A friend of a friend found it while roof bolting in a coal mines in Southern Illinois. I am stumped and google has come up with nothing helpful. I'm hoping that someone here can help me figure out what this is. This is the only photo I have of it but will ask if he can get a few more with better lighting and stuff. He says it feels like bone but isn't sure. Would appreciate any help you can give! Thanks