See, as you drive up the brow, how the grey limestone walls to the right become mottled with a darker rock. This dark gritstone is the dominant rock to your left. Maintaining a limestone wall is no easy task. Limestone does not occur in neat layers as with millstone grit. It might be so rough on the hands, they would bleed if gloves were not worn.
Small stones form the packing.
A row of captsones helps to protect the wall. If a gap occurs, the material for repair is readily to hand. This permits mixed grazing, restraining cows but allowing sheep to enter the next field. A large piece of slate is available to block the gap as necessary. At one farm, a cripple 'oil was just large enough to take the donkey.