C.A. Repenning was dedicated to the usefulness of stratigraphically controlled fossils, and I have attempted to adhere to that principle in this study. I thank the Institute for the Study of Earth and Man and the Doris O. and Samuel P. Welles Research Fund of the University of California Museum of Paleontology for the financial support that allowed me to conduct the fieldwork and research for this project. Additionally, I would like to thank the United States Forest Service for its support and permit enabling me to do the fieldwork. I thank K. Padian and P. Holroyd from the University of California Museum of Paleontology, C. Sidor and R. Eng of the Burke Museum of Natural History and Culture, and T. Fremd and S. Foss for specimen loans, collections access, and assistance.
This work fulfilled part of my master's thesis and I would like to thank my advisor, L. Jacobs, and my committee members, D. Winkler, N. Tabor, and T. Fremd for their field assistance, guidance, and discussions. I especially thank T. Fremd for introducing me to this project and to paleontology in the Pacific Northwest. I thank P. Hammond and D. Gusey for their enthusiasm for the project, and I especially thank P. Hammond for allowing me to use the radiometric ages. I thank J. Baichtal, K. Newman, D. Vineyard, R. Beavers, and D. Nixon for their field assistance, lab assistance, and specimen preparation.