Uplift of a peneplain commonly results in renewed erosion. This contact is regarded to be a classic example of an ancient peneplain. Nearby plains adjoining the gulf are part of the Sub-Cambrian peneplain. The peaks of these mountains are all remnant features of this peneplain. An example of a primary peneplain is the Sub-Cambrian peneplain in southern Sweden. The upper parts of the Pyrenees contain low-relief surfaces forming a peneplain. In the case of Stockholm the plateau surfaces are remnants of the Sub-Cambrian peneplain. Any exposed peneplain detached from its baselevel can be considered a paleosurface or paleoplain. The competent old rocks of the Armorican Massif have been eroded to a plateaulike peneplain. The Sub-Cambrian peneplain of Late Neoproterozoic age is the oldest of the surfaces. The chain, once split open, continued to erode until it formed a peneplain. This peneplain originated no earlier than in Late Miocene times. The peneplain concept is often juxtaposed to that of pediplain. Notwithstanding dramatic local differences in elevation, much of the state is a gently rolling peneplain. The peneplain is no longer in the cycle of erosion that witnessed its production.