Parasitic Folds

Parasitic folds in the Nordfjord-Sogne extensional detachment zone, Norway. The parasitic folds are asymmetric S-folds on the top limb, asymmetric Z-folds on the bottom limb, and generally symmetrical in the tight hinge region. Photo credit: Paul M. Evins. Image from website: http://www.student.oulu.fi/ ~pevins/folds.htm