I found this in a creek, and would like to know if it is even a fossil. The creek is in southern Ohio, in the mountains on the glacial boundary. The river Teays ran through this location. I usually just have a look if passing creeks and don't know a lot about fossils yet, though I've found crinoids and brachipods in the same spot, and other fossils. There are a lot of interesting geofacts. I couldn't find any pictures online that look like this for anything mississipian. This one is 145 grams. (I guess the ruler is all inches, I thought one side was centi as I didn't pay close attention until I added them, sorry.)