The shell is probably Schizodus I am told. The impression of the Crinoid is well defined. In my opinion this specimen worth keeping. Schizodus was first described by W. King in 1844. It’s interesting to wonder if this impression was left during the burial process, or was the result of compression of the rock over 305 million years of time.
More online about Schizodus
- Taxon Page – Fossilworks