Lovelock, Nevada, is about eighty miles northeast of Reno. It was in a cave near here, in 1911, that guano miners found mummies, bones, and artifacts buried under four feet of bat excrement. The desiccated bodies belonged to a very tall people - with red hair.
As hair decays, it can change in color.
Though there is a theory right now that the racial group we call Neanderthals were red heads. Maybe there were some in the New world!