Ischigualasto Provincial Park, Argentina

April 22, 2020


April  2020 Viewer's ChoicePhotographer: Eduardo Juliá 
Summary Author: Eduardo Juliá 

The mushroom-shaped rock featured above was observed at Ischigualasto Provincial Park in San Juan province, Argentina (also called Valley of the Moon). This formation, known as a hoodoo, clearly shows differential weathering -- in this case erosion by persistent winds. Erosion in the bottom layers, composed of soft clay, occurred more rapidly than it did in the overlying harder and more resistant sandstone, resulting in the pedestal or mushroom shape. Photo taken on March 15, 2020.

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