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The author studied the alluvial lowland in the lower reaches of the Hino and the Echi Rivers, to clarify landform development of the Kotoh plain to the east shore of Lake Biwa, central Japan, during the middle and late Pleistocene.Four major litho-stratigraphic units (A-D) and five tephra layers (Sakate, AT, DNP, hpm2, Ng-1) were detected from standard penetration test samples of Kominami borehole site cores from the lower reaches of the Hino River. Judging from the facies of the borehole samples and a geological cross-section through the Kominami site in the lower reaches of the Hino and the Echi Rivers, coarse sediments were deposited at least 4 or 5 times during the last 300 ka and the distribution of gravel deposits was much larger especially during the period from ca. 80 to 27 ka than at present. The appearance and shrinkage of the area where gravels were deposited seem to be related to interglacial-glacial or the interstadial-stadial cycles.

chigaku zasshi/chigaku zasshi

Sedimentary Sequence and Landform Development in the Kotoh Plain in the Ohmi Basin, Central Japan: Based on Analyses of Borehole Samples from the Lower Reaches of the Hino and the Echi Rivers