| Ancestral Puebloan periods |
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Archaic–Early Basketmaker Era 7000–1500 BCE |
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Early Basketmaker II Era 1500 BCE–50 CE |
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Late Basketmaker II Era 50–500 |
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Basketmaker III Era 500–750 |
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Pueblo I Period 750–900 |
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Pueblo II Period 900–1150 |
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Pueblo III Period 1150–1350 |
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Pueblo IV Period 1350–1600 |
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Pueblo V Period 1600–present |
During the Pueblo IV period, Four Corners pueblo settlements were abandoned (northern and central portion of the Ancestral Pueblo region.)
The Pueblo IV Period (AD 1350 to AD 1600) was the fourth period of ancient pueblo life in the American Southwest. At the end of prior Pueblo III Period, Ancestral Puebloans living in the Colorado and Utah regions abandoned their settlements and migrated south to the Pecos River and Rio Grande valleys. As a result, pueblos in those areas saw a significant increase in total population.
The Pueblo IV Period (Pecos Classification) is similar to the "Regressive Pueblo Period" or, referring to the Ancient Pueblo People of Colorado and Utah, the "Post Pueblo Period." It is preceded by the Pueblo III Period, and is followed by the present Pueblo V Era.