The mechanism of indentation in arcuate belts is discussed using the Jura M
ountains as an example. Using fault-inversion analysis from numerous sites,
the Miocene-Pliocene stress pattern is reconstructed. Two superimposed com
pressional stress fields have been recognized, Considering the theoretical
distribution of compression in front of a rigid indenter, we interpret the
complex stress pattern in the Jura Mountains as a result of a major change
in the mechanism of indentation of the Jura by its hinterland. Initially, t
he indenter was narrower and limited in the southwest by the Vuache transfe
r fault. With time, it expanded to the southwest and included the entire Mo
lasse basin. This evolution highlights the importance of decoupling along f
aults, which here controlled the indenter shape.