the spongy surface of the rocks in the przadki nature reserve

abstract age arcade background bizarre carvings cellular chunk coarse crust detail eocene erosion erosive exfoliation fancy form forms furrows geological geology lifeless limonitic mushy narrows natural nature pass pits podkarpackie poland porous province przadki reserve rock rocks rough sandstone shales shape solid spinners spongy stone structure surface texture textured vallecula voivodeship weathering