Oregonia, OH

Hi, can anyone help my 12 year old ID this fossil? He found it at camp.

https://preview.redd.it/1ih8r6f7ngfh1.jpg?width=3024&format=pjpg&auto=webp&s=623d50a5f90d7452ced3c33f006e336e75e46dcd

https://preview.redd.it/mkdxs7f7ngfh1.jpg?width=3024&format=pjpg&auto=webp&s=96e28edc7b4460e980ba4c901434250299ae75d8

https://preview.redd.it/qdl7y6f7ngfh1.jpg?width=3024&format=pjpg&auto=webp&s=d6aaf68f42f2b6e5cc1925622fa5cf009a0aa3f3