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Layers of Teriary age volcanic ash (Geronimo Head Formation) form colorful shapes in Arizona's Usery and Superstition Mountains, east of Phoenix

   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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