fossil of arctoceras septentrionale on black

art iron rock jewellery sculpture metal carving wood silver statue ceramic mineral gemstone geology bead money boulder fossil arctoceras septentrionale black ammonoidea ancient animal arctoceras septentrionale arctoceratidae black cephalopoda ceratite closeup collection devonian devonian period diener form fossil fossils geological geology kiparisova lower triassic mesozoic natural nature old paleontology rock shell stone subhydaspis