Abstract
In karstic areas, tectonic phenomena have two major influences. (i) By uplift, they give potential energy to karst and valley hollowing. (ii) An active tectonic regime is necessary for the development of karstification. The opposition between the development of valleys or karstic networks depends on the type of dissipated energy. Karstic systems in the Ardennes Massif are essentially between 5 and 15 m above the water table for the dry networks, and in the phreatic zone for the active parts. The structuration of the karstic systems is dependent on the uplift of Ardennes and an active tectonic regime is necessary for the genesis of large caves. It is during the Upper and Middle Pleistocene that the Ardennes area underwent tectonic activity; these karstic levels are more than 400 000 years old.
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