Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Miura Mitsuyo and Kurokawa Katsuki,"Volcanic ash markers in the Nobegawa route, east of Ojiya City and their regional correlation in the Niigata sedimentary basin",Earth Science (Chikyu Kagaku),03666611,The Association for the Geological Collaboration in Japan,1995,49,1,45-60,https://cir.nii.ac.jp/crid/1390282679210829952,https://doi.org/10.15080/agcjchikyukagaku.49.1_45