 This unconsolidated material (it is not stuck tightly together) is very easily eroded hence the rapid rate of retreat of the coastline of this region.A similar situation exists in east Yorkshire in the Holderness district.The chalk outcrop at Flamborough Head in the north produces a headland relatively resistant to coastal erosion whilst the coastline south of this at such places as Mappleton and Hornsea with their soft glacial deposits are vulnerable.