Sea-Level Change from the 10th to 17th Centuries around Lake Saroma, Eastern Hokkaido

摘要

Eastern Hokkaido is known to be the area where marker tephras for the historic ages are widely distributed. The authors analyzed the diatoms in the sediments which are inter- calated between the tephras of Ma-b (Mashu-b volcanic ash erupted ca. 970) and Ko-c2 (Koma- gadake-c2 volcanic ash erupted in 1694), and tried to reconstruct the paleoenvironment of this area.