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Mojave River Valley Museum
Joshua Tree National Park >
Rock PilesThis rock pile was once a solid mass of granite- monzogranite. It formed 85 million years ago from magma crystallizing some 15 miles below the existing ground level. Earthquakes stressed and cracked the rock. Mountain uplifting moved the rock closer to the Earth's surface.
Groundwater seeped into the cracks, rounding and shaping the rock blocks. Further uplifting and erosion exposed the rock above ground. Once exposed, weathering and erosion continued the sculpting and breakdown of the granite, making the rock into its present form.
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Geology tour road
Granitic rock formation in the Mojave Desert