Abstract
The Navaho Reservoir District is an arbitrarily defined unit of salvage archaeological research located in northwestern New Mexico and adjacent portions of Colorado. As such, it is used here as a data source for the study of ninth and tenth century population dislocations due to climatic change and river erosion. The affected Pueblo farming peoples migrated by means of slow, steady upstream drift. Violent land competition between the agrarian communities is offered as an explanation for the use of the leap-frog rather than wave strategy in population relocation.

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