The Clovis people

The specific piece of obsidian that MacDonald found in 2013 was roughly 11,000 years old and appeared to have been purposely chipped. This indent was quite telling, as it suggested that the artifact had once belonged to members of the Clovis culture. These people were skilled hunters, who used to feast on creatures such as mammoths and now-extinct species of bison. Bill Whittaker/Wikimedia Commons | CC BY-SA 3.0