El Morro, photo

El Morro

El Morro National Monument, New Mexico, 2014

Most of El Morro itself is Zuni sandstone, a compaction of sand grains of the same size as those found in dunes.  It is thought that a massive dune field once covered a huge swath of the four-corner states over 100 million years ago. . Photo © copyright by Greg Owens.

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