Geographic distribution of the Hokan languages suggests that they became separated around the great central valley of California by the influx of later-arriving Penutian and other peoples; archaeological evidence for this is summarized in Chase-Dunn & Mann (1998). These languages are spoken by Native American communities around and east of Mount Shasta, others near Lake Tahoe, the Pomo on the California coast, and the Yuman peoples along the lower Colorado River. Some linguists also include Chumash, between San Francisco and Los Angeles, and other families, but the evidence is insubstantial, and most now restrict Hokan to some or all of the languages listed below.