ammonite fossil passendorferia teresiformis

ammonites shelled index fossil passendorferia teresiformis jurassic oxfordian southern europe wrinkles vertical shadows texture relief polished ammonoids extinct marine mollusc animals cephalopoda mollusks rock layer mineral species fauna nature geologic planispirals helically spiraled fossilized shells natural light closeup macro invertebrates ammonis cornua horns egyptian god ammon amun rams