stonewall with a fossilized snail-like shell of a once-living creature. the natural stone blocks with traces of ancient organisms

aged ammonite ancient antique background banner belemnite blocks cast circle creature detail digged digging evolution evolutionary extinct fossil fossilization fossilized geological imprints jura jurassic living marks mold molluscs mussel old once organism paleontology prehistoric preserves record scale shell snail specimen spiral stone stonewall texture timescale trace tracks