Thursday, May 16, 2013

yet another example of a cap rock

Last week we were camping along the Colorado River above Moab Utah when we saw these pillars showing how a more resistant chunk of sandstone will protect the less resistant shale below. The last blog post showed how the more resistant White Rim sandstone was left standing even after the softer Organ Rock shale had all eroded away leaving a really fun arch to visit.

Differential erosion of the Cutler formation along the Colorado River

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