Here in south-central Montana we have remnants of the seabed from the Western Interior Seaway. Many impressions of what I can only describe as an S-shaped, fossilized sandworm exist. Recently a spalled piece of sandstone revealed this fossil (see photo) and I am curious to know exactly what creatures existed in the Cretaceous era that could be correctly identified as the one that made these impressions. Thanks for any help!
I retrieved the loose half, the concave portion (seen lying on the ground below the fossil), for interpretive, educational use and wonder if I should or need to apply any type of hardening agent to this very crumbly rock.