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   of age surrounds the visitor in a view from the Natural Tunnel, just off the Hidden Valley Trail in South Mountain Park.  This tunnel, actually formed by a rockfall, is a popular rest spot.
   South Mountain is a great place to see the structure of a , as well as a variety of Sonoran Desert vegetation.
   These rocks were once thought to be much, much older -- in age -- but new theories of formation and our understanding of the geology here tell us that they are indeed younger than the Precambrian western end of South Mountain.
 
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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.
   You can also send this as an E-Postcard to your friends!

Intense desert sunlight greets the viewer from inside the tunnel on the Hidden Valley Trail.
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