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rock tower desert sandstone erosion time nature landscape geology formation pillar mesa butte crag pinnacle spire monolith outcrop strata layer sediment sedimentary rock formation natural arch canyon gorge slot canyon wadi ravine gully arroyo wash draw coulee gulch glen canyonlands badlands desert landscape arid dry barren wasteland wilderness uninhabited remote isolated desolate forsaken abandoned lonely solitary secluded quiet still peaceful tranquil serene