A Southwestern Archaic tradition of the Four Corners region of southwestern U.S. It was an Archaic hunting and gathering culture from c 5500 BC to c 400 AD. There are five phases based on projectile point form, artifact assemblages, and socioeconomic organization. These phases are: Jay, c 5000-4800 BC, and Bajada, c 4800-3300 BC of the Early Archaic with nomadic bands of foragers and hunters; the San Jose Phase, c 3300-1800 BC; the Armijo Phase, c 1800-800 BC, with maize horticulture introduced; and the En Medio Phase, c 800 BC-400 AD, which encompassed the Basketmaker II Phase of the Anasazi culture.