Hi, I found this fossil yesterday on the beach(?) of Ivösjön.
Should be from either early - or old - Cretaceous since those are the two known periods carrying fossils in this area.
It looks brainy, and I have searched but haven't found anything similar for the cretaceous period.
It looks a bit like modern scleractinian, but I'm not sure? It has these s-curve patterns, draping-like foldings.
I kind of like it. It looks a bit like a rock brain.
All the Best/ Linus
I've posted more fossils from this area in these threads.