red rock spires below a cloudy sky in arches national park.

arches red rock spires clouldy cloudy sky national park colorado moab utah natural sandstone delicate arch unique geological formations evaporite salt formation rocks fins eroded monoliths paradox plateau uncompahgre uplift jurassic desert vast navajo windblown sediments entrada remnants cretaceous mancos shale thrust layers domes evaporites anticlines faulting displacement fault visitor center • tourist • tourism • desert • barren • dry • hostile • harsh • vegetation • arid • precipitation deserts • temperature • erosion • sandstorm • dust storm • sand dunes • bedrock • shade • conserving • irrigation • solar • sunlight