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Joshua Tree > Nature Trail > Arch Rock

The Contact Zone

Geological contact zone
Look across the valley at the ridge in the distance and you can see another type of rock that is common in Joshua Tree National Park. This rock is known as Pinto Gneiss and it lies on top of the lighter colored White Tank Granite. Look closely and you can see the actual zone where the White Tank Granite meets the Pinto Gneiss. As the process of erosion or wearing continues, rock on top is broken down, exposing the rock underneath.

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Some content is based on reconstructed historical context and has been reviewed for accuracy; interpretation may evolve. For educational use only; not a travel or safety guide. Copyright © Walter Feller, 1995–2026. All rights reserved.