1954  Hayasaka, p.371: at the height of 460 m above sea, in
           small valley of the Budozawa, a tributary of the
           Katchizawa, Setamai-machi, Kesen-gin, Iwate
           prefecture. Fine-grained sandy shale, upper part of
           the Kanokura series.
     1998  Ehiro, p.150.