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Primitive Neolithic Civilizations 71 A MAYA STELE Showing a worshipper and a Serpent God. Note the grotesque faces in the writing It was at the Neolithic phase of human development that peoples of the Mongolian breed first made their way into America. Appar- ently they came by way of Behring Straits and spread southward. They found caribou, the American reindeer, in the north and great herds of bison in the south. When they reached South America there were still living the Glyptodon, a gigantic armadillo, and the Megatherium, a monstrous clumsy sloth as high as an elephant.
