differential solution of a limestone rock

abstract acid across against background berdorf black blue broken cave chemical chipped closeup corrosion crack dent detail differential due eroded erosion flock geese geology gothic grunge hard hole holes holland image inches karst limestone luxemburg macro massive max migrating mineral monochrome natural pale part pattern pitted precipitation rain rock rough rustic sandstone sedimentary size sky solution spotted stain stone structure surface texture wall wallpaper watered weathered weathering white