the imprint of a prehistoric ammonite shell in a stone. paleontological preserved evidence of ancient life. spiral fossil. snail-

aged ammonite ancient antique belemnite cast circle creature detail digged digging dug evidence evolution evolutionary extinct extremely fossil fossilization geological imprint imprints jura jurassic life living marks mold molluscs mussel old once organism outdated paleontological paleontology prehistoric preserves record scale shell snail specimen spiral stone texture timescale trace tracks wheel