Abstract
This paper discusses structure and variations in structural style due to changes in mechanical stratigraphy of the Helvetic nappes based on five cross-sections. The ratio, n, of the thickness of mechanically weak to the thickness of adjacent mechanically strong layers is of particular importance. A low value of n favours imbricate thrusting and harmonic folding, a high value favours detachment and disharmonic folding. The transition at around n = 0.5 is characterized by polyharmonic folding. Stratigraphic thickness variations due to local basin subsidence resulted in arcuate fold hinges and important plunges upon basin inversion. Lateral variations in the overall structure of the Helvetic nappes is largely controlled by the initial irregular arrangements of the various small basins. One more or less coherent thrust sheet, the Cretaceous stockwerk of the Wildhorn-(Drusberg-) Säntis nappe can be traced along the entire fold-and-thrust belt.
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