natural rock formation around poulnabrone dolmen

around beneath black brown burren called clare cliffs clints county crack dew different dolmen dramatic dry edge environment eroded erosion field flutes formation gap geologist grass green grikes hills hole insoluble ireland karren karstic karstification landform landscape lapiez layered level limestone line little made morning natural nature overlying pavement popular portal poulnabrone rock runnels sharp site slimy slippery small solid stone study subject surface surrounding the tomb topography vegetation water wet wind