PETER FALKNER / SCIENCE PHOTO LIBRARY PETER FALKNER / SCIENCE PHOTO LIBRARY
Eroded rocks. Eroded sedimentary rock formations. These rocks were formed during the Permian period (between 286 and 245 million years ago). Seen here are horizontal layers of soft shale, capped by harder, more resistant sandstone. Over time, erosional forces such as water, ice and wind have acted on the rocks, producing flat-topped plateaux with sloping bases. These are known as mesas or buttes, depending on their size. Mesas are larger than buttes. Photographed in Monument Valley Navajo Tribal Park, in Arizona and Utah, USA.
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