Folds in rocks of the hills of the Monts d'Arrée, near Commana in the department of Finistère in Brittany, France. These are small Z-folds or S-folds (depending on which direction they are viewed) on the limbs of a larger fold. The view is about 10 centimetres across. The dark-coloured rock is schist of the Plougastel Formation, of Paleozoic age, with bands of white quartzite.