coastal erosion in liencres, cantabrian coast

coastal erosion sedimentary rocks stratum landform black shale limestone marl formations wave cove rhytmite pedruquios madero costa quebrada lithology geological joint diaclasa marlstone eroded materials sediments turonian cenomanian rock lithological layers weathered sea tide beach cliff stratification steep crest marine coast displacement litoral landscape seascape liencres broken cantabria spain scenic scenery coastline cantabrian landforms action cliffs coves northern