Florida divers find Columbian mammoth leg bone from Ice Age-era at the bottom of a river Howard Cohen, The Miami Herald May 5—Florida beaches give up all sorts of, well, treasures. Sometimes you find bales of drugs valued at over a million. (Not that you get to keep it.) A naval sea mine washed ashore along Lauderdale-by-the-Sea in April. And just a month prior, U.S. military target drone washed ashore on the beach at Ocean Ridge Hammock Park. But what Derek Demeter, the director of Seminole State College's Emil Buehler Perpetual Trust Planetarium, and his pal Henry Sadler, a Florida school teacher, discovered embedded in the sand while scuba diving Peace River in Arcadia on April 25, has been waiting to be found for a long time.