Ключевые слова: aged, ammonite, ammonitida, analyzing, ancient, animal, anthropology, archaeologist, archeology, background, biology, bone, digging, discovery, epoch, era, evolution, fossil, geologic, geological, geology, hands, historic, history, invertebrate, jurassic, mineral, mollusk, natural, nautilus, old, outdoors, paleontologist, paleontology, past, pattern, person, prehistoric, science, scientist, seashell, shell, skeleton, snail, spiral, stone, surface, swirl, symbol, time,