I found this weird fossil rock and I am wondering if anybody could help identify what could have made the imprint in it or what kind of rock it is?
Looks like a sand dollar fossil. Note the pentagonal shape in the middle.
I found out today that this strange "fossil rock" is actually a sea biscuit (common name) in the class echinoidea. Sand dollars are flat, but the sea biscuits are "puffy". I found this out in my zoology class!