 Uncommon are larger bones including fin spines, jaws, cranial material, clavicles, limb bones and pelvic bones.Arthropods include Paleolimulus woodae, an extinct horseshoe crab.Contrary to some erroneous reports in the popular press, it is not the world's oldest horseshoe crab (Order Xiphosurida), but is scientifically instead the oldest paleolimulid (Family Paleolimulidae).