poconos mountains, pennsylvania, usa: close-up of the veins in a weathered rock

abstract america american ancient background bank black brown close closeup design designs detail discoloration environment erosion forming geologic geology granite grassy macro material mountains natural nature northeast old outdoor pattern patterns pennsylvania pile poconos reflected rock rocks rough rural rustic sedimentary stone stones stream surface texture textured textures tourism travel usa vacation vacations veins volcanic wall walls weather weathered weathering