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Hidden Valley is formed by about 10 square km of hydrothermal breccia. A wide variety of lithologies is mixed in this breccia with clasts that range from mm to >100 m in size. PhotoID147

Hidden Valley is formed by about 10 square km of hydrothermal breccia. A wide variety of lithologies is mixed in this breccia with clasts that range from mm to >100 m in size. PhotoID147

Photograph: Paul Bons