2000-1450 years ago (50 BC - 500 AD)
Lifeway: Nomadic hunters and gatherers
Dwellings: Caves, rockshelters, large deep pithouses
Diet: Bighorn sheep, small game, seeds and nuts
Tools: Atlatl/spear; mano/metate.
Special traits: Basketmaking
Challenge: Continued drying of climate.
Response: Exploit more environmental niches by planting vegetables and grain
Result: Added domestic food crops to diet