1. School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea
2. Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, Minnesota, United States
3. Institute of Paleontology, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
4. Hokkaido University Museum, Hokkaido University, Sapporo, Japan
5. Department of Physics Education, Gyeongsang National University, Jinju, South Korea