Delicate Arch in Arches National Park near Moab, Utah. Courtesy of Flickr user Dimitry.S. Some of the most stunning structural feats aren’t built by architects or sculpted by artists. From Bryce ...

Perhaps you have heard tell of hidden natural sandstone arches in northern New Mexico, and among them a free-standing thin ribbon of rock. Anasazi Arch rises from its mother stone in a perfect ...

Gravity, not glue, allows towering sandstone pillars and arches to withstand howling wind and pouring rain, researchers propose July 20 in Nature Geoscience. Sandstone forms when tiny sand grains bind ...

Igneous rocks are rebels. Sedimentary rocks follow straight-forward rules—they are deposited in horizontal layers, with the oldest sediments on the bottom. Igneous rocks can do what they want. Molten ...

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 ...