1. John Day Fossil Beds National Monument, U.S. National Park Service, 32651 Highway 19, Kimberly, Oregon 97848 (United States) and Department of Earth Sciences, University of Oregon, 1272 University of Oregon, Eugene, Oregon 97403 (United States)
2. Department of Biology, Gonzaga University, 502 East Boone Avenue, AD Box 5, Spokane, Washington 99258 (United States)