Differential Erosion
  
These images don't link to other pages, but they are at sufficiently high resolutions for power point.
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 |  Differential erosion of resistant sandstone overlying less resistant shale, Monument Valley, Arizona. | 
|  Isolation of monoliths, SE Utah. Person for scale on skyline at right. |  Hogback ridge, capped by resistant Dakota Sandstone, Colorado. |  Stair-Stepped topography produced by erosion of alternating sandstone and shale, Utah. | 
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