Ancient Pueblo People
The Mancos Valley has been settled since at least the 10th century, although various severe conditions in the mid to late 13th century saw the area and its multitude of small villages abandoned by the Ancient Pueblo People (Anasazi). The Mancos area is dotted with inventoried and uninventoried archeological sites, including both isolated houses and shelters and small village complexes. Mancos Valley residents were probably among those who withdrew to the cliff dwellings on Mesa Verde, perhaps for defensive purposes, due to climate change, or as part of concentration policy of possible invaders and occupiers of the region.
Archaeological sites of the Ancient Pueblo period include:
Bement site, a Colorado State Register of Historic Properties site, representing the first and second Pueblo periods. Between AD 750-850 there was one shelter on the site. About 150 years later, a group of six structures were inhabited from 1000 to 1150.
Lost Canyon Archeological District, on the National Register of Historic Places, which may have been the northernmost boundary of the Mesa Verde Ancient Pueblo People from about AD 1000-1300.