Although the architectural styles used by these people evolved throughout their history, the pithouse remained a basic residential structure. Pithouses are found in isolated rural settings, in conjunction with above ground dwellings and adjacent to the large multi-room cliff dwellings characteristic of the region. Historian Linda Cordell notes that "...the late pithouses are often clues to relatively short-term changes in settlement location and adjustment to climatic fluctuations. " (Cordell, p. 164) This appears to be true among the modern Pueblo peoples as well. When the Hopi village of Bacavi was founded in 1909, some groups of people arrived in the late autumn. As there was a limited window of time for building, the new arrivals built pithouses as warm shelters for the winter. Some of these homes remained occupied until the 1970s.