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About: Sub-Cambrian peneplain     Goto   Sponge   NotDistinct   Permalink

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The sub-Cambrian peneplain is an ancient, extremely flat, erosion surface (peneplain) that has been exhumed and exposed by erosion from under Cambrian strata over large swathes of Fennoscandia. Eastward, where this peneplain dips below Cambrian and other Lower Paleozoic cover rocks. The exposed parts of this peneplain are extraordinarily flat with relief of less than 20 m. The overlying cover rocks demonstrate that the peneplain was flooded by shallow seas during the Early Paleozoic.Being the oldest identifiable peneplain in its area the Sub-Cambrian peneplain qualifies as a primary peneplain.