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Photographer's Note

The "mushroom" is a curious geologic formation eroded by winds and rains during 250 millon of years. Its one of the simbols of the Ischigualasto - Valle de la Luna National Park.

It has about 30 feet tall and is a rocky compound of different origins. The lower part, the "body" of the mushroom, is sedimentary rock, so you can see the "seam" or "veins" in the rock. Each "vein" is a period of mud avalanches, which later turn more hard and finally turns in a sandy-like and soft rock.

The superior part of the mushroom, its "head", is a volcanic rock, much harder than the lower part. So when the winds erodes both rochs, the lower part (softer) erodes quickly during millon of years, resulting in the mushroom shape.

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Additional Photos by Patricio Burraco (pburraco) Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 113 W: 15 N: 112] (861)
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