Abstract
Youngest ophiolitic rocks in Japan produce in the Mineoka Tectonic Belt. But outcrops are scares in the Belt by reason of landslide based on tectonic deformation. In gravels in conglomerate of younger strata in and around the Belt and floats at riverbed and beach in the Belt, various kind of ophiolitic rocks are find out than those in outcrops, and they become the key of investigation of origin and development of the Belt.