1997  Ehiro & Araki, Kurosawa district, middle part of the
           Ochiai Fm. consisting mainly of massive sandy shales
           and shales
           with rare thin limestone interbeds, widely distributed
           in the Kurosawa River and its tributaries. Loc. A-1:
           about 100 m lower than Lepidolina-bearing lenticular
           limestone.
     1998  Ehiro, p.150, fig.3: Toyazawa Mb.; Kattisawan Stage of
           Kanokuran Series.