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Notes on the Geography of The Western United States: Northern Arizona: Photo 18

world pictures The Western United States: Northern Arizona

There's no more warning than that: you're over the edge of the Grand Canyon. Sharp eyes looking at this particular picture may recognize a bit of the Bright Angel Trail as it traverses the gently inclined Hermit Shale and approaches the sheer Coconino Sandstone. That cliff is made of dunes consolidated about 280 million years ago. On top of it, there's the soft and sloping Toroweap Formation, capped by the near-vertical Kaibab Limestone, a marine formation deposited a quarter-billion years ago.

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