Good Afternoon Y'all! Took the pup out to one of my favorite spots this morning and came across this odd ball. Never seen anything like it. It was in a part of the creek that had been washed out from all the rain yesterday. No markings on it or shell impressions. In the same area i come across mostly those bottle cap looking shells and a nice little bit of coral if that helps. Found in Austin, TX down near the pleasant valley bridge on the east side. Thanks for the help!