sedimentary, Grand Canyon National Park, desert, stair-step topography, erosion
https://geologypics.com/wp-content/uploads/2017/07/geology-pics.png00Marli Millerhttps://geologypics.com/wp-content/uploads/2017/07/geology-pics.pngMarli Miller2018-05-26 22:45:582018-05-30 07:14:14Great unconformity, Grand Canyon, AZ
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