About the Author

Raymond R. Rogers is professor in and chair of the geology department at Macalester College in St. Paul, Minnesota. David A. Eberth is a senior research scientist at the Royal Tyrrell Museum in Drumheller, Alberta, Canada. Tony R. Fiorillo is a faculty member in the Department of Geological Sciences at Southern Methodist University and curator of paleontology at the Dallas Museum of Natural History, Dallas, Texas.