The San Rafael Reef, at the eastern edge of the San Rafael Swell, as seen from Interstate 70 near the town of Green River, Utah.

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The San Rafael Reef, at the eastern edge of the San Rafael Swell, as seen from Interstate 70 near the town of Green River, Utah. These flatirons (also known as a hogback) are made of Navajo sandstone, a formation that is much more resistant to erosion than the layers above or below it. The rock, once level, has been tilted upward as the ground behind it rose.

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Size: 4256px × 2832px
Location: I-70, Green River, UT 84525, USA
Photo credit: © Ken Barber / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 70, colorado, desert, flatirons, formation, geology, hogback, interstate, navajo, plateau, rafael, reef, san, sandstone, swell, travel, utah