Ancient Civilizations Timeline

  • Oct 9, 700

    Cahokia first Established

  • Period: Oct 9, 700 to Oct 9, 750

    SW area - First Permanent large settlements

    Alkali Ridge, Utah, Chaco, Dolores River Valley
  • Period: Oct 9, 775 to Oct 9, 975

    Hohokam, AZ - Rapid change of lifestyle

    colichee covered trash heaps
  • Oct 9, 820

    Sacred Ridge Massacre - Durango, CO

    It is a multiple habitation site of 22 pit structures, some of which may have operated as communal ritual facilities for a population that extended beyond the immediate site inhabitants. He found that the population at Sacred Ridge in the early 800s was distinct from others in the area. The remains and other artifacts at the site, Sacred Ridge in Colorado, indicate ethnic cleansing took place there in the early ninth century. The unearthed bones and artifacts indicate that when the violence took
  • Period: Oct 9, 850 to Oct 9, 1000

    Chaco Canyon Viewed as sacred

  • Period: Oct 9, 900 to Oct 9, 1050

    Chaco Buildings Built

  • Period: Oct 9, 900 to Oct 9, 1100

    rising water tables in CO area, milder climate changes, more predictability

  • Period: Oct 9, 900 to Oct 9, 1200

    Cahokia - Monks Mound Construction

  • Period: Oct 9, 975 to Oct 9, 1150

    Snake Town AZ - trash mounds surrounded by stockades, ball courts every 3 miles or so

  • Oct 9, 1000

    Cortez, CO - Yellow Jacket Pueblo Est

  • Period: Oct 9, 1100 to Oct 9, 1200

    Cahokia - Peak

    100,000 people, Houses were arranged in rows around open plazas. Agricultural fields and a number of smaller villages surrounded and supplied the city. Extensive trade
  • Oct 9, 1130

    Chaco Canyon no longer has population

  • Oct 9, 1130

    chaco river shrinks

  • Oct 9, 1150

    Acoma continuous populaton

  • Period: Oct 9, 1150 to Oct 9, 1300

    Snake town changes again, no ball courts, no mounds, made walled complexes

  • Period: Oct 9, 1200 to Oct 9, 1400

    Cavell Advance (Little Ice Age)

    1200-1900
  • Oct 9, 1240

    Cliff Dwellings est Mesa Verde

  • Oct 9, 1240

    Cortez CO, pop leaves bean fields for Cliffs

  • Period: Oct 9, 1250 to Oct 9, 1400

    Cahokia site abandoned

  • Oct 9, 1270

    SW Colorado looks abandoned

  • Period: Oct 9, 1275 to Oct 9, 1300

    Great Drought

  • Period: Oct 9, 1276 to Oct 9, 1299

    Great Drought - AE Douglas

  • Oct 9, 1280

    Population drop in Mesa Verde

  • Oct 9, 1280

    Gallina disappeared