I found this in Wayne County TN, USA at a road cut on Hwy. 641 close to the Hwy. 64 intersection. Not sure of age or formation but Devonian/Silurian and maybe Brownsport? I'm thinking it is a Calceola sandalina from the research I've seen. I found a post that Dave Hayward had posted in 2010 on Views of the Mahantango. Rudists and Hyolithids was mentioned. I was wondering if I could get a confirmed ID as to what mine might be? Thanks For Looking and Your Assistance.