This volume of the Animas-La Plata series (SWCA Anthropological Research Paper No. 10) contains three sections: geomorphological studies, archaeobotanical studies, and vertebrate faunal studies. The first section comprises studies of landscape change and stability, soil fertility, and paleoclimate in Ridges Basin. The second section comprises six chapters describing and interpreting modern environmental, macrobotanical, and pollen analyses conducted as part of the project. The final section describes and interprets the vertebrate faunal data recovered during project excavations.