A large corpus of data on plant remains from prehistoric feces yields patterns of prehistoric Four Corners Anasazi diet. A general stability of plant-food consumption continues from at least the Basketmaker III through Pueblo III periods, with corn being the one consistently common fecal remain. Other agricultural plantsmboth crops and weedsmare important throughout the region. There is temporal and spatial variation in the types and abundance of macroplant remains recovered from these feces. Temporally distinct assemblages from the same study area are more similar than contemporary assemblages from different areas. This indicates the importance of the local resource structure (both natural and human maintained) as a major factor influencing dietary composition, even within a relatively small region such as Four Corners of the northern Southwest.