an ancient ammonoidea ammonite naturally imprinted on a stone on the beach of rovinj, croatia

age ammonite ammonites ammonoid ammonoidea ancient animal aquatic archeology beach biology cephalopod cephalopoda coastline detail devonian discovery environment era evolution exoskeleton fauna geological geologist geology jurassic macro marine mineral mollusk natural nature old organism paleontology past pleistocene prehistoric rock sea skeleton spiral stone structure surface texture travel wildlife