and they may have been here much ealier than previously thought.
i like this, it reinforces the theory i heard a few years ago, that the Hopi peoples creation theory was actually a true story.
that they really had emerged from the sipapu in the Grand Canyon, as that was the extent of the glacier cover, after they had come across the land bridge, and down the coast.
the Colorado river was a clear path and they walked out of the open plain of the mohave, and to the edge of the Colorado Plateau.
http://archaeologynewfinds.blogspot.com/