Apishapa occupations after 1400 on the Chaquaqua Plateau. What followed was evidence of tipi villages in the presence of earth rings about in diameter, surrounded by spaced rocks. Archaeological artifacts at the sites include metates, manos, scrapers, gravers, projectile points, and flakes of Alibates chert. See Picture Canyon Tipi ring period. See also Apishapa cultural findings at: Franktown Cave Picture Canyon Trinchera Cave Archeological District List of prehistoric sites in Colorado Prehistory of Colorado References Archaeology of the United States Archaeological cultures of North America Hunter-gatherers of the United States Native American history of Colorado Plains Village period Post-Archaic period in North America Pre-Columbian cultures Prehistoric cultures in Colorado