Photographer's Note

The top layer of rock at Arches National Park is "Entrada Sandstone". Here was once a massive desert of fine grained sand dunes, nearly spherical shaped, and when packed together, forming a very porous rock.
Beneath the Entrada Sandstone is the "Carmel Layer", a mix of sand and clay making a denser rock.
Then deep below the surface lies a thick layer of salts. Squeezed by the tons of rocks above it, salt flowed and bulged upward, creating long domes. The forces cracked the rock covering layers.
The Park averages 18 - 23 cm of rain per year.
Rainwater soaks into the Entrada sandstone, slowly dissoving sand's calcite bonding. Rotting the rock from the inside out. Water puddles just above the Carmel Layer where it erodes like a cavity. In winter, water trapped between the two layers expands when it freezes and pries the rock apart.

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Additional Photos by Ray Anderson (photoray) Gold Star Critiquer/Gold Note Writer [C: 1203 W: 1 N: 3169] (13981)
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