The Normandy Mountains
These are true mountains, because the land was uplifted and folded twice, firstly 540 million years ago (the Cadomian block) and then again 345 million years ago (the Hercynian orogenic belt). Originally these mountains were as high as those in the Alps, but erosion over the millenia has almost ‘erased’ these two colossal mountains.
Halfway down the slope, on the way down to the Rouvre, you can see the “superimposed” roots of these 2 terraced giants and the more recent folds of purple puddingstone (a rock made up of quartz sand and gravel) resting on a bed of granite.