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Environmental Implications of Japan's Geology 09,  Andesite breccia, evidence of violent volcanic eruption, Aketo.
Andesite breccia, evidence of violent volcanic eruption, Aketo. -- Rocks like this andesite breccia are abundant in Japan. The large, dark-colored, angular blocks were blasted from a volcano during a violent eruption and fell to earth where, along with ash and other volcanic debris, they became part of this rock. The size and abundance of the chunks attests to the violence of the eruption. The presence of rocks like this of different ages and in different parts of the country indicates that explosive eruptions have been widespread during Japan's geologic history.
 
Editorial assistant: Joseph Augustin. Collection Librarian: Amy Bryant. -- Please send any questions, comments, or content corrections to Michael Thiedeman, Professor of Art, Earlham College, Richmond, IN 47374 USA. email address: thiedmi@earlham.edu -- With reference to this set of images dealing with the geology of Japan, you may wish to contact Dr. Charles Martin, Professor Emeritus, Department of Geology, Earlham College, email: martich@earlham.edu