Vertical Structural Variation and Their Development of the Sanukayama Rhyolite Lava in Kozushima Island, Japan

Kuniyuki Furukawa, Aichi University, Faculty of Business Administration, Aichi, Japan, Koji Uno, Okayama University, Graduate School of Education, Okayama, Japan, Tatsuo Kanamaru, Nihon University, Department of Geosystem Sciences, College of Humanities and Sciences, Tokyo, Japan and Kotaro Nakai, Okayama University, Graduate School of Natural Science and Technology, Okayama, Japan