We would like to acknowledge the assistance of several individuals. The sharp eyes and quick mind of J. Muench were invaluable in locating Dinosaur 1. Rangers B. Bailey and G. Gower and volunteer C. Gilbertson helped P.S. and J. Muench locate the site. Archaeologist Laura Martin put P.S. in touch with S. Cole, and L. Lantz and S. Edwards provided expert field analysis. Photos in Figure 1 were taken by J. Muench and P.S. Two anonymous reviewers provided useful suggestions that improved this manuscript.