Hello. I found these on a Croatian island - they don't strike me as one of their regular Jurassic finds, as it appears to be more inside a fault of petrified red soil amidst the abundant limestone. They look kinda "new". Can anyone tell me what they are? I found them on two locations. Not a geologist, so no idea. Whale and other large marine life bones? Polished by the sea? After some seizmic event?