Kiva in foreground, Wupatki Pueblo, inhabited from approximately 1100 AD to 1250 AD, Wupatki National Monument, Arizona, United States of America, North America

Wupatki Pueblo, inhabited from approximately 1100 AD to 1250 AD, Wupatki National Monument, Arizona, United States of America, North America

West Ruin, Aztec Ruins National Monument, dating from between 850 AD and 1100 AD, UNESCO World Heritage Site, New Mexico, United States of America, North America

Wukoki Pueblo, inhabited from approximately 1100 AD to 1250 AD, Wupatki National Monument, Arizona, United States of America, North America

Montezuma Castle dating from 1100-1400 AD in limestone cliff, Sinagua, Arizona, USA, North America

Lomaki Pueblo, inhabited from approximately 1100 AD to 1250 AD, Wupatki National Monument, Arizona, United States of America, North America

Pueblo Bonito from 1000-1100 AD, Anasazi site, Chaco Canyon National Monument, New Mexico, United States of America (U.S.A.), North America

Open Kiva in West Ruins, Aztec Ruins National Monument, dating from between 850 AD and 1100 AD, UNESCO World Heritage Site, New Mexico, United States of America, North America

Lomaki Pueblo, inhabited from approximately 1100 AD to 1250 AD, Wupatki National Monument, Arizona, United States of America, North America

Kivas and rooms, foreground rock fall destroyed part of pueblo, Pueblo Bonito 1000-1100 AD, Anasazi site, Chaco Canyon National Monument, New Mexico, United States of America (U.S.A.), North America

Kivas, Pueblo Bonito dated at 1000-1100 AD, Anasazi site, Chaco Canyon National Monument, New Mexico, United States of America (U.S.A.), North America

Pueblo Indian Montezuma Castle dating from 1100-1400 AD, Sinagua, Arizona, United States of America (U.S.A.), North America

Early Onset AD: DNA, Chromosomes and Genes