Most of the formations at Arches are made of soft red sandstone deposited 150 million ... to be classified as an arch, the opening must measure at least three feet across. The largest arch in ...

The natural arch treasures found in this region of the American Southwest are a vibrant collection of nature's best creations. The oxidation of iron found within the sandstone has created a red ...

An accretion of iron molecules leaves a bizarre pattern in the sandstone. For larger image, click here. Photo by Jeff Mitton. The multitude of parks on the Colorado Plateau is testimony of our ...

While the rectangular form of the new structure is seemingly simple, the red sandstone facade designed ... no keystone waiting at the point of each arch, the red hues and finished quality of ...