The morphologic features of the Rhine river plain in Alsace (France) and Baden (Germany), observed during airplane reconnaissance, corroborate and supplement data obtained by geologic investigations, borings, and geophysical prospecting relating to the structure of the Rhine trough and associated surface forms. It is concluded that, below the alluvial deposits of the plain, the terrain is highly folded and faulted and that crustal movements, which produced a regional structure resembling a piano keyboard, continued to the present time.

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