Other scientists scoffed when Carl Gustafson claimed he had evidence that Stone Age people were hunting mastodons 14,000 years ago in the Pacific Northwest. At a site near Sequim, Wash., Gustafson found mastodon remains including a rib with a foreign piece of bone imbedded in it. He concluded it was a weapon carved from bone or antler and hurled at the tip of a spear by people who had arrived centuries before the rise of the Clovis hunters – long presumed to be the first Americans. The year was 1977. (via Mastodon hunting site from 13,800 years ago confirmed in Washington | OregonLive.com)