1. Department of Astronomy, Space Science and Geology, Chungnam National University, Daejeon 34134, Republic of Korea
2. Department of Earth Science Education, Korea National University of Education, Cheongju 28173, Republic of Korea
3. Geological Museum, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Republic of Korea
4. Department of Geological Sciences, Chungnam National University, Daejeon 34134, Republic of Korea