I found this fossil on the beach in Makarska (Croatia) (about 2-3 years ago), but I don’t know which fossil this is. Could you answer this?
Asker: Vid, 14 years old

Answer
Dear Vid
This is a fossil or relatively recent shell of a bivalve (Bivalvia). With some good will you can still recognize the shape of a Pecten shell (or something similar), but due to wear and tear in the surf at the beach, the edges of the shell have completely disappeared.
Answered by
Prof. dr. Robert Speijer
Geology – Paleontology – Paleoclimatology. You study geology in Leuven!
Catholic University of Leuven
Old Market 13 3000 Leuven
https://www.kuleuven.be/
Old Market 13 3000 Leuven
https://www.kuleuven.be/
.