1. [Research Associate, Section of Vertebrate Paleontology, Carnegie Museum of Natural History] Rochester Institute of Vertebrate Paleontology, 265 Carling Road, Rochester, New York 14610 wwkorth@frontiernet.net
2. North Dakota Geological Survey, 600 East Boulevard Ave., Bismarck, North Dakota 58505 caboyd@nd.gov
3. North Dakota Geological Survey, 600 East Boulevard Ave., Bismarck, North Dakota 58505 jjperson@nd.gov