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In page Cuyamaca Rancho State Park:

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Cuyamaca Rancho State Park is located in the Peninsular Range, which extends from the San Jacinto Mountains north of the park, southward to the tip of Baja California. At the western edge of the most seismically active area in North America, the range is a great uplifted plateau, cut off from the Colorado Desert to the east by the Elsinore Fault Zone, where vertical movement over the last two million years has amounted to thousands of feet of tectonic uplift.