Maryland: A dinosaur bone at an archaeological site? No, there were no dinos patrolling the Eastern Seaboard 1,000 years ago. Rather, the bone, from an unidentified species, had been collected by Native Americans living at Pig Point, a site with a 10,000-year history, for use as a pot boiler, a heated stone used for cooking purposes. It came from the Arundel Formation, a sandstone deposit that offered up some of the first dinosaur bones to be studied in the 19th century.