The Pueblo IV Era (1350 to 1600) is the fourth period of ancient pueblo life in the American Southwest.
At the end of prior Pueblo III Era, Anasazi living in the Colorado and Utah regions abandon their settlements and migrate south to the Little Colorado River and Rio Grande valleys.
As a result, pueblos in those areas see a significant increase in total population.The Pueblo IV Era (Pecos Classification) is similar to the "Regressive Pueblo Period" or, referring to the Ancient Pueblo People of Colorado and Utah, the "Post Pueblo Period."
