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National Park ServiceA view of the High Peaks
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A close-up view of rhyolite breccia  

Did You Know?
Rhyolitic breccia is the rock that the High Peaks and other rock formations at Pinnacles are made of. Rhyolite breccia is composed of lava sand, ash, and angular chunks of rock that were explosively ejected from the Pinnacles Volcano.

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Last Updated: July 25, 2006 at 00:22 EST