Pueblo III Era

The Pueblo III Period (AD 1150 to AD 1350) was the third period, also called the "Great Pueblo period" when Ancestral Puebloans lived in large cliff-dwelling, multi-storied pueblo, or cliff-side talus house communities. By the end of the period the ancient people of the Four Corners region migrated south into larger, centralized pueblos in central and southern Arizona and New Mexico.

Pueblo III Period (Pecos Classification) is roughly the same as the "Great Pueblo Period" and "Classic Pueblo Period" (AD 1100 to AD 1300).

During the Pueblo III Period most people lived in communities with large multi-storied dwellings. Some moved into community centers at pueblos canyon heads, such as Sand Canyon and Goodman Point pueblos in the Montezuma Valley; Others moved into cliff dwellings on canyon shelves such as Mesa Verde or Keet Seel in the Navajo National Monument. Typical villages had included kivas, towers, and dwellings made with triple coursed (three rows of stones) stone masonry walls. T-shaped windows and doors emerged for both surface and cliff dwellings.

Cliff Palace at Mesa Verde National Park

Puerco Pueblo walls of up to 100-125 rooms at the Petrified Forest National Park

Bandelier National Monument Talus House

Bandelier National Monument Cavates

Three major regional centers with cliff dwellings and community centers were Chaco Canyon National Monument in New Mexico, Mesa Verde National Park in southwestern Colorado and Betatakin and Keet Seel area (Navajo National Monument) in Arizona.

...
Wikipedia