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