Hi everyone. Of all stones I have found, this one puzzles me the most and I don’t know what to think about it. It would be nice to hear from you, even if it would just mean excluding the possibility that it is a fossil. I'm sharing the photos and all the information that might be useful.   The place: Mount Medvednica has risen some 10 million years ago, at an area of ex Pannonian sea. The mountain is made of palaeozoic and Mesozoic rocks. There are deposits of limestone and dolomi