Sites of the Paleo-Indian in the Middle Rio Grande Valley

The problem of the antiquity of man in early America has rapidly divided itself into a series of detailed researches, each one dealing with special facets of the matter. To date the greatest progress in the relationship between the various cultures of the paleo-Indian has been made with geologic methods by which the rhythm of climatic changes of the late Pleistocene and recent times has been tied in with deposits involving human materials. The radiocarbon method has now appeared to bolster and refine the time scale. From all of these activities there is rapidly emerging a clearing picture of early times in the Americas.