nautilus fosil dinosaurio excavaciones in a dino parc.

fossil nautilus shell spiral ammonite ammonitida ancient background cephalopod closeup evolution extinct fossilized geological geology mineral nature old paleontology prehistoric prehistory rock skeleton snail stone swirl texture textured ammonites animal beautiful circle fossilization jurassic life marine mollusk museum natural disaster ocean pattern era refinery science sea seashell white ammanites octopus