Grand Canyon is younger than geologists think

If what you're saying is that a gradually formed Grand Canyon should have sloping rather than vertical sides, an effect caused by a process known as slope retreat, then yes, that's what we find at the Grand Canyon: sloping sides. Here's a picture: --Percy

Time to take stock and see where we are in this discussion.

1. Booboo's point: The elevation of the top of the canyon is about a mile higher than the river. Since rivers don't flow uphill, erosion by the Colorado River could not be the cause of the canyon.
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   Rebuttal: The river stayed at roughly the same level by eroding downward during a period of regional uplift.
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   Outcome: Evolutionists carry this point
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2. Booboo's point: There are no age-old erosion marks between the sedimentary layers visible on the sides of the canyon, indicating that the rock layers were deposited simultaneously.
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   Rebuttal: MechanicalBliss replied that there are several disconformities between sedimentary layers, the most obvious being (I'm now adding more specific info) that between the Tapeats Sandstone and the Grand Canyon Supergroup. There are also disconformities between the Redwall and Temple Butte limestones. It's also important to note that the limestone, shale and sandstone layers of the Grand Canyon were deposited while the region was submerged, and that submerged regions typically, but not exclusively, experience only deposition. Most erosion occurs in regions exposed to the weather.
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   Outcome: Evolutionists carry this point
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3. Booboo's point: If uplift caused the Grand Canyon then it would have sloping sides.
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   Rebuttal: I provided a picture of the sloping sides of the Grand Canyon.
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   Outcome: Evolutionists carry this point
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4. Booboo's point: Erosion would wear away the continents in 14 million years, so the Grand Canyon could not be millions of years old.
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   Rebuttal: No one directly addressed this point, but the answer is once again uplift.
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   Outcome: Evolutionists carry this point

Is there any more discussion on this topic?--Percy