DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Cross-bedded sandstone layers. Checkerboard mesa sandstone rock formation, showing cross-bedding. This sedimentary rock was formed by the deposition of successive layers of sediment carried in water or air currents, later compressed into rock. The cross-bedding (thick horizontal lines) was produced by changes in the direction of the depository currents over time, Photographed in Zion National Park, Utah, USA.
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