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| What the author's believe is Dakota Sandstone, are the beginning of the cliffs making up the walls of Picture Canyon. The cavity seen in the middle of the picture is believed to be water-carved. | |
| Total images: 16 | Help | |
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| What the author's believe is Dakota Sandstone, are the beginning of the cliffs making up the walls of Picture Canyon. The cavity seen in the middle of the picture is believed to be water-carved. | |
| Total images: 16 | Help | |