sedimentary, Grand Canyon National Park, desert, stair-step topography, erosion, strata
https://geologypics.com/wp-content/uploads/2017/04/geologic-time-pics-logo-300x115.png00Marli Millerhttps://geologypics.com/wp-content/uploads/2017/04/geologic-time-pics-logo-300x115.pngMarli Miller2018-05-26 22:45:582021-11-22 10:35:49Great unconformity, Grand Canyon, AZ
