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In contrast, secular science has taught that the Colorado river eroded the canyon gradually over millions of years based on the uniformitarian assumptions. Geological Survey has revealed that "Geomorphic change in Grand Canyon is largely catastrophic in nature, especially on a decadal time scale, and changes to debris fans resulting from debris flows are usually obvious." Among the marine fossils found here are sea lilies, which are restricted to fairly deep waters, about 60m to 300m deep.