Why do many layers of rocks of varying origins like shale and sandstone in the Grand Canyon have reddish hues?

The Hakatai Shale is a Mesoproterozoic rock formation with important exposures in the Grand Canyon, Coconino County, Arizona. It consists of colorful strata that exhibit colors varying from purple to red to brilliant orange. These colors are the result of the oxidation of iron-bearing minerals in the Hakatai Shale.



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Each geological rock layer of the Grand Canyon is a piece of the puzzle of the history of the Earth. Each layer contains clues into what kind of environment was present when the layer was being deposited. As well as the plants and animals that were living during this chapter of time.

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Most of the Colorado Plateau was uplifted relatively evenly, keeping the layers roughly horizontal, creating the layer cake appearance common throughout the region (such as at the Grand Canyon).

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Over time, pressure increases as sediment increases, and minerals help form these rock layers. Metamorphic rocks are formed when sedimentary or igneous rocks change due to exposure to heat and/or pressure.

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20 Amazing Grand Canyon Facts
  • Grand Canyon National Park is bigger than the entire state of Rhode Island. ...
  • The Hopi Tribe considers the Grand Canyon a gateway to the afterlife. ...
  • Temperatures vary greatly within the canyon. ...
  • The canyon is full of hidden caves. ...
  • In 1909, the canyon was the site of a giant hoax.


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20 Amazing Grand Canyon Facts
  • Grand Canyon National Park is bigger than the entire state of Rhode Island. ...
  • The Hopi Tribe considers the Grand Canyon a gateway to the afterlife. ...
  • Temperatures vary greatly within the canyon. ...
  • The canyon is full of hidden caves. ...
  • In 1909, the canyon was the site of a giant hoax.


MORE DETAILS