TUCSON, Arizona, June 19 -- The University of Arizona issued the following news release: * * * Earliest evidence of humans in the Americas confirmed in new U of A study By Kyle Mittan Vance Holliday jumped at the invitation to go do geology at New Mexico's White Sands. The landscape, just west of Alamogordo, looks surreal - endless, rolling dunes of fine beige gypsum, left behind by ancient seas. It's one of the most unique geologic features in the world. But a national park protects much o more PR