Abstract
Heavy minerals have been collected from the coarse sandstones of the Jurassic Yamaoku formation., These minerals are allanite, anatase, augite, biotite, clinozoisite, epidote, garnet, hornblende, muscovite, rutile, titanite, tourmaline, zircon, zoisite, and opaque minerals such as hematite, ilmenite, magnetite, and pyrite., Three zones of heavy mineral associations are recognized in the formation., These zones transect the lithologic boundaries of the formation., The cause of this transection is not clear., The source materials of the sediments may be granitic, andesitic, and basaltic rocks as well as pre-Jurassic sedimentary rocks.,
