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Angular unconformity - horizontal Tonto Group (Cambrian) over tilted Grand Canyon Supergroup (1.1-1.2 Ga), Grand Canyon, Arizona 1 | by James St. John
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Angular unconformity - horizontal Tonto Group (Cambrian) over tilted Grand Canyon Supergroup (1.1-1.2 Ga), Grand Canyon, Arizona 1

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Taken on September 5, 2007