A friend of mines 8 year old son found this in a creek bed in Sumner Co. He's very interested in my fossils and thought I would like it and wanted to know what it was. I don't have the coordinates but looking at the geology of Sumner co. it could be anywhere from middle Ordovician to Devonian, from what I could find though I think the Devonian outcrops are farther north towards the Kentucky border so probably Ordovician. At first I was thinking concretion? Or sponge?