山陰の海岸砂丘 (日本海沿岸の砂丘<特集>)

概要

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Most of the San' in sand dunes are those of'dune ridge'(dune on the beach ridge) type which was proposed in the essay of D.W. JOHNSON (1919). So called'old dunes'are not the simple dunes but old dunes on the old beach ridge and beach berm which formed at +25m former sea level. These old sand deposits were covered with brown soil and dissected and excavated by the wind and stream. The old sand dunes were formed on these marine deposits and brown soil and then covered with red soil, grey clay and Daisen middle volcanic ashes. New sand dunes which formed in Holocene are well developed everywhere along sandy coast. In Kyuhin penninsula three curved beach ridge groups are clearly recognised on which three new sand dunes were developed. These new dune ridges are widespread and their zonal or linear pattern are useful for analyzing dune formation history. New dune Ia and Ib are discovered under the black sand a and b respectively along inland part of the dune pattern. The New dune IIa, IIb and IIc are found near the present shoreline. These new dunes seem to have been formed after Jomon, Heian and very recent transgressions, respectively.
日本第四紀学会の論文