beautiful fossils belemnites with marcasite

belemnite stone fossil paleontology cretaceous mineral belemnoidea chalk squid devil finger prehistoric science marine cuttlefish belemnoid palaeontology cephalopod fossilized ocean palaeontological paleontological scientific cephalopoda collection ancient rock mollusca mineralized guard group extinction coleoidea carbon geology marcasite treasure precious gem semiprecious mineralogy bright rare shiny specimen mining jewelry geological natural gift