4. From the end of the sedimentation of Paleogen materials to mid Miocene (16,4 to 11,2 million years), the growth of the Pyrenees folded the north half of district of Bages in a few parallel, narrow anticlines that often become fault folds welded with large and smooth synclines in between.
At the time when the anticlines were created, evaporites beneath spread into their nucleus in a diapirism process. As a result, the saline geological formation, that was originally several hundreds-meter depth, nowadays emerges to the surface in Cardona.

[drawing Oriol Oms]