The Foothills between Peace and Liard Rivers comprise an elongate fold belt containing sedimentary rocks mainly of Mississippian, Triassic, Jurassic, and Late Cretaceous ages. Most exposures belong to the Gething-Debolt structural-stratigraphic unit. The upper part of this unit shows curvilinear and box and cuspate fold profiles, thecentral part has deformed passively, and the lowest part tends to show angular fold profiles and faults. Zigzag en echelon patterns predominate in the fold belt and become more complex in the north. Fold amplitude and wave length decrease northward.