Dual-Scale Weathering

Joshua Tree Park

The landscape of rounded boulders at Joshua Tree Park, California, are the legacy of weathered bedrock. As overlaying material is eroded away, the release in pressure leads to exfoliation — shedding the crust of weathered rock. On a much shorter timescale, after early farmers built Barker Dam, the changing water level stained the surrounding rocks with a record of climatic variation.

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