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Hi all, Found these two shells in Antwerp, Belgium. It was in a place with lots of sand, and the sea was rather far away. There are tons of Pliocene shells there to be found. I also found these two bivalves. What I find really weird is that the periostracum (the brown layer) is still preserved!? How could that be? Nearly all fossil shells lose it when fossilizing, yet these two seem to have kept it. What do you think is the answer to this mystery? Fossils, with the periostracum preserved, or modern (but how did they get here?)? (Or maybe this isn't a periostracum at all. But what is it then?) I think that the species are Mytilus edulis and Spisula subtruncata (although that's by far the biggest Spisula I have ever seen) (both present modern in the North Sea, and occur as fossils in Belgium). I'm greatly anticipating your thoughts on this! Max