Abstract
Two formation patterns are recognized archaeologically for surviving rice paddy fields which were covered with soil. The first is the case of flooding: thick alluvial soil covered the fields. The other is volcanic activities, in which volcanic ash exploded over the fields; this pattern is characteristic of Gunma Prefecture. This study is focused on both horizontal analysis, by reconstruction of its distribution pattern by means of micro-geographical method, and vertical analysis by the observation of the cross-cut sections in order to determine their superimposition at each site. To know its distribution over a broad area which was prospected by observing the ground surface, aerial photographs and large-scale maps are helpful. Also, an interdisciplinary approach is especially important for this kind of research.
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