Areas east of Phoenix, near Mesa and Apache Junction, such as these cliffs in the Usery Mountains, display great views of colorful volcanic rocks.  These ochre layers are known as the Geronimo Head Formation, and consist of volcanic ash erupted from the Superstition Mountains area around 16 million years ago, during the .
 
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   See the GeoHistory page if you want to know more about why the landscape looks the way it does, or return to the map of "The Rocks of the Valley of the Sun" for more view locations.
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