Along much of the cliff face there is alternate bedding of these
two materials, each layer varying between 0.25 01 and 2 m m
thickness; the shales generally form thicker beds than the limestone.
The differential erosion of these two materials is clearly visible, having created a stepped face in the cliffs,with the limestone standing out much further than the shale, and this is 'particularly noticeable towards the foot of the cliffs where marine erosion processes rather than subaerial erosion dominate. Where the shales form the bottom of the cliff faces they produce slopes of less than 45°, whereas the limestone can retain a vertical slope.