Abstract

A series of cross sections and drillings in the infilling deposits of the dales and valleys of the Maine and the Cher basins, allows us to assess the morphodynamic evolution which has taken place since the Lateglacial period, and to insist on the longitudinal changes. The Lateglacial incision appears to have been general but very unequal in an upstream-downstream direction, for every river, whatever its length. The effects of downstream erosion did not go as far as those of the upstream erosion, so that the Weichselian alluvial sheet of periglacial origin lies buried under the Holocene deposits in the middle parts of the rivers, whereas it lies above in the upstream and downstream sections. The Holocene infilling deposit, coarse in its lower part, especially on the outer limits north of the Massif Central, is constituted mostly of silts resulting from an overflow which did not occur before the Subboreal period; the whole process is both climatic and anthropic.

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