XXXV. THE STONE AGE IN EASTERN CANADA, UTAH, AND DAKOTA 330 Eastern Canada 330 The Plains of western and central Canada 333 The stone age in Utah 336 Objects made of wood 336 Textiles; feather objects; bone objects 337 Objects made from teeth; shell objects; stone objects; pottery objects 338 The stone age in Dakota 339 Hide and bark 339 Objects made from deer antlers; bone objects; shell objects 340 Stone objects 341 Objects of copper; of pottery; of unbaked clay 342 XXXVI. CONCLUSIONS 344 The population in prehistoric times 344 The stone age in historic times 348 The antiquity of man in America 350 Adaptation to conditions 354 Art in ancient times and modern art 355 XXXVII. CONCLUSIONS 357 The ancient culture-groups 357 The stone-age point of view 363 Field study needed 365 BIBLIOGRAPHY 369 INDEX 411 THE STONE AGE IN NORTH AMERICA CHAPTER XXV GROUND STONE EFFIGIES IN STONE AND WOOD—BIRD-STONES Aboriginal man traced all sorts of figures on the rocks and occasionally on the surfaces of flat ornaments and ceremonials. Not only did he make pictures on shell gorgets and on birch bark, but he also carved complete figures.