Abstract
To clarify factors causing uneven heaving on a cutting plane of Tertiary Miocene Notoro formation, mineralogy, chemistry, and rock texture were examined. Samples are four argillaceous rocks collected from the cores of noticeably or slightly heaving points. Results showed that the samples of the noticeably and slightly heaving points have similar mineral and chemical compositions, but their rock textures are different. The samples of the noticeably heaving point have coarser granular variations than those of the slightly heaving point, and the matrix of the former was more widely impregnated with fluorescent resin than it of the latter. When it is assumed that the heaving occurred from the influence of water, the uneven heaving may result from difference in void structures which developed closely correlating with the granular variations.
