Dixon’s position, which he took in 1923, is in some ways a more radical one than Hooton’s. He introduces “Proto-Australoid,” “Proto-Negroid,” and Mediterranean elements, and also Caspian and Alpine; but, where Hooton recognizes a general stock in which Australoid, Negroid, and Mediterranean were blended before their arrival, Dixon brings in his races separate and pure, and he assigns them definite areas in the New World.
Dixon’s Proto-Australoid originated in tropical southeast Asia. It spread westward “through India and the Arabian coasts to Africa, and by way of the Mediterranean passed into western Europe, where it appeared in early Paleolithic times.... Another branch spread southeast into Australia, where its early presence is proved by the Talgai skull,” perhaps 150,000 years old. “A third branch drifted slowly northward up the eastern Asiatic littoral, and, crossing into America, spread thinly through the continents, and perhaps mainly along the western shores.... On the Pacific Coast in California and Lower California it appears to constitute the oldest stratum, characterizing as it does the crania from the lower layers of the shell-heaps, from the islands of Santa Catalina and San Clemente off the Coast, and from the extinct Pericue [now Pericú] isolated on the southern tip of the peninsula of Lower California.” Dixon places some of his Proto-Australoids among the ancestors of the Iroquois and the southern Algonquin tribes of the East. He puts most of his Proto-Negroids in that same eastern area and with the same tribes. He finds them generally east of the Rockies, but also among the Basket Makers in the Southwest and the peoples of the Coahuila Caves of northern Mexico, in the Lagoa Santa area in Brazil, and in Patagonia.[7]
Two of the White types—the Caspian and the Mediterranean—seem rather scattered and rather early. Dixon thinks that a Caspian strain may have appeared as soon as the Proto-Australoid, perhaps sooner. It crops up among the Eskimo and at spots in British Columbia, and widely in South America. The Mediterranean influence, Dixon says, is found also among the Eskimo and among Shoshonean and Siouan tribes.
Dixon does not think much of the Mongoloids. Believing they were a very old people that drifted into Europe in early paleolithic times, he says they “contributed little of value either to the sum of human achievements or the blood of existing races.” He gives them only scant space in North America. Instead he introduces two other round-headed peoples. They are first the Paleo-Alpines, and later the Alpines. These, who seem to take on the role played by the Mongoloids of Hooton and others, spread through to South America and “displayed striking ability.... To them seems to be attributable most of the higher achievements of the aboriginal American peoples.”[8]