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2a. Vertical rock strata | by kqedquest
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2a. Vertical rock strata

Evidence of the park's volcanic past reveals itself along the hike. These layers of shale were once mud at the bottom of a body of water that once covered the region. Now, they're not only above ground, but are nearly vertical, owing to the pushing and plowing of the tectonic plates that continue to give Northern California its famous earthquakes.

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Taken on November 26, 2007