Cotton Creek Pass, Colorado

Ryan is currently biking across America, sending photo updates of his adventures. He’s sent back photos of an awesome natural rock wall in the Cotton Creek Pass on Colorado State Highway 125, Grand County, Colorado.

This is a dyke structure, a radiating sublinear length of volcanic rock from a cooled fissure. In this instance, the dyke is made of more resistant material and the surrounding rock has eroded away, leaving a free-standing wall.

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