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The tilted pre-Flood sediment layers are up to 14,000 feet (4,260 m) in thickness, but are only exposed in the eastern canyon and in a few other areas.
Over the last 30 years, the time frame for the carving of the Grand Canyon has gone full circle.
Thirty years ago, most evolutionists believed the canyon was about 70 million years old.
The uppermost folded layers have been beveled by erosion and overlaid by the flat-lying Wasatch Formation, which is younger.6 Furthermore, gravel deposits (from the Paleocene and Eocene epochs and thus younger than the folded Cretaceous layers) occur within channels eroded into the surface of the Kaibab Plateau, indicating the major uplift of the plateau and the accompanying erosion of its surface coincided with the uplift of the whole Colorado Plateau.7 Therefore, in evolutionary thinking the plateau is geologically “old,” and most evolutionary geologists believe its uplift occurred before erosion of the canyon into and through the plateau.
But that leaves the headwaters of the Colorado River at a lower elevation than the top of that plateau, which indicates the Colorado River could not have carved the Grand Canyon!