Authors
Yorinao Shitaoka
Department of Environmental Systems, Rissho University, Kumagaya, Japan
Takeshi Saito
Department of Geology, Shinshu University, Matsumoto, Japan
Junji Yamamoto
The Hokkaido University Museum, Hokkaido University, Sapporo, Japan
Masaya Miyoshi
Department of Science and Mathematics Education, University of Fukui, Fukui, Japan
Hidemi Ishibashi
Department of Geosciences, Shizuoka University, Shizuoka, Japan
Tsutomu Soda
Institute of Tephrochronology for Nature and History Co., Ltd, Maebashi, Japan