1. Dinosaur Trackers Research Group; University of Colorado Denver; CB 172 PO Box 173364 Denver CO 80217-3364 USA
2. School of the Earth Sciences and Resources; China University of Geosciences; Beijing 100083 China
3. Department of Earth Science Education; Korea National University of Education; Cheongwon Chungbuk 363-791 Korea
4. Department of Environmental Sciences; Tokyo Gakugei University; Koganei Tokyo 184-8501 Japan