An ancient river may have laid the canyon's foundation.
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References
Flowers, R. M. et al. Geol. Soc. Am. Bull. in the press (2008).
Polyak, V., Hill, C. & Asmerom, Y. Science 319, 1377-1380 [(2008).
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Courtland, R. Grand Canyon's 55-million-year-old secret. Nature (2008). https://doi.org/10.1038/news.2008.750
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DOI: https://doi.org/10.1038/news.2008.750