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Geology of the Park
An outstanding feature of Castle Rock State Park are the sculpted rock outcrops that are found in many areas of the park, but primarily along Castle Rock Ridge. These rock outcrops, called bosses by geologists, are formed from very thick layers of Vaqueros Sandstone which have been exposed at the surface. The smooth and rounded rock shapes are interrupted by unique formations called collectively tafoni. Geologists believe that finger pockets to whole cave systems are carved out of the rock by a chemical “cavernous weathering” process which occurs because of the rock, rainwater, and the wet winters and dry summers of California’s Mediterranean climate.
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