Geologists do agree on the canyon's age - six million years - and that it offers a wealth of information. Aside from its breathtaking beauty and awe, one of the factors holding allure for geological study is that information is so readily accessible (Anonymous, 2000; p. geology). The cuts made either by the Colorado River or some other ancestral river that flowed in the other direction leaves layer upon layer exposed for the study. Geologists take advantage of the opportunity, and continue to debate the canyon's origins.

One author is eloquent in explaining the Grand Canyon's geological appeal:

The Grand Canyon's greatest significance lies in the geologic record that

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