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| Zoomed-in view of the muddy Colorado River as seen from Cape Royal on the North Rim of Grand Canyon National Park. The Great Unconformity is an angular unconformity in this view. The unconformity is near the top of the image and is located between the flat-lying Tapeats Sandstone overlying gently dipping beds of Precambrian-age sedimentary rocks of the Grand Canyon Supergroup (Billingsley, 2000). |
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