Follow the chronology of prehistoric dates that were significant for the ancient residents of Chimney Rock National Monument:
<250 A.D.: Hunter/Gatherer Occupation
900-1125 A.D.: Ancestral Puebloan Occupation
950-975 A.D.: Ridge House construction Phase I
1000-1125 A.D.: Evidence of upper Cuesta use
July 1054 A.D.: The supernova, which produced the Crab Nebula, was visible in the daytime sky for three weeks and in the nighttime sky for about two years.
December 1057 A.D.: At the winter solstice, the full moon rose between the chimneys, and archaeoastronomists speculate this was discovered by the residents of Chimney Rock.
1064 A.D.: Sunset Crater Volcano eruption. The crater is north northwest of Flagstaff, AZ.
1066 A.D.: Hailey’s Comet appeared on the eve of the Battle of Hastings. The comet covered one-fourth of the nighttime sky.
1073-1077 A.D.: Period of a Major Lunar Standstill. It is estimated that the moon appeared between the chimneys on more than forty occasions.
1076 A.D.: Possible Great House construction
1077 A.D.: Pit House construction began
1077 A.D.: Sunspots large enough to be seen with the naked eye were reported in China, beginning two hundred years of unusual sunspot activity.
1078 A.D.: Ridge House construction Phase II
1084 A.D.: Great Kiva construction began not much later than 1084.
1093 A.D.: Great House construction Phase II
1094 A.D.: Major Lunar Standstill
July 11, 1097 A.D.: Total solar eclipse passed directly over Chimney Rock
1111 A.D.: Major Lunar Standstill
1125 A.D.: People left Chimney Rock
1150 A.D.: Chaco decline begins
1100-1200 A.D.: Drought and cooler temperatures
1280 A.D.: People left Mesa Verde
1300 A.D.: Four Corners area empty of Ancestral Puebloans
Following is an Ancestral Puebloan Culture Time Line from the 1928 Pecos Conference: