The Pecos Classification is a division of all known Ancient Pueblo Peoples culture into chronological phases, based on changes in architecture, art, pottery, and cultural remains. The original classification dates back to consensus reached at a 1927 archæological conference held in Pecos, New Mexico, which was organized by the United States archaeologist Alfred V. Kidder.
Read more about Pecos Classification: Original Classification, Current Classification, Notable Puebloan Sites