I can’t see the bottom one very good, but the top specimen look like it could be a horse molar fossil. I don’t know where these were found, but horse molars are most prevalent in Florida.

Lucky! It looks to me like the top of a mammoth/mastodon tooth. I’d do sone research on those

I used to find these and kept them until my grandpa told me that they were just rocks that solidified on top of a small mound of dirt, sand or other sediment. I don’t know how trust worthy my grandpa is, but it made sense to me. Still a cool find nonetheless

@shaun-rhoads is your family from the Pennsylvania/Ohio region?

It could be erosion, but it could also likely be what’s called a phycode. Most phycodes are casts (or coming above the rock it’s in), but some are molds (meaning it dips into the rock like yours). Basically, phycodes are tunnels dug by animals like worms or animals that have an anchoring “foot”, that hole is filled and it leaves a defined impression.

Hey Pat, I did some quick research on fenestrate bryozoans, and it looks really similar. I found this in Ohio, and it says that most fenestrate bryozoans are found in Kentucky, which isn’t to far from me. Thank you for the new insight!