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Yellow layers of Tertiary age volcanic ash are visible near Castle Hot Springs, near Lake Pleasant, northwest of Phoenix, Arizona.

   This yellow layer of volcanic ash near Castle Hot Springs resulted from great explosions of volcanic rock during the .  Similar layers can be seen in the Usery Mountains and Superstition Mountains, east of Phoenix, Arizona.  Known as the Geronimo Head Formation, it forms colorfully smooth slopes that provide a scenic home for the brilliant lichens that seem to love living on them.
 
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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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