ammonite fossil

ammonite ammonoid ammonoidea ancient animal animals antique archeology background biology brown cephalopod cephalopoda coil coiled coleoids collect collection creature creatures cretaceous curve dactylioceras dead death deep devonian die dinosaur dying evolution extinct extinction find fish fishes fossil fossilised fossilized geological geology historic history jurassic life live living lower marine mollusc mollusk natural nature nautiloids nautilus ocean of old paleo paleogene paleontology period prehistoric prehistorical prehistory rib ribbed sea seashell shape shell snail species spiral squid stone texture triassic upper water