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Perforations galore pock the soft sedimentary canyon walls of Arroyo Tapiado in Anza-Borrego Desert State Park.

Along the canyon walls of Anza-Borrego's Arroyo Tapiado ("Mudwall Wash"), weathering and erosion acting on friable sedimentary rock have produced a strange kind of topography known by some geologists as pseudokarst. Like karst topography, which ...

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