This photograph from northwestern New Mexico shows a ridge roughly 30 feet (about 10 meters) tall that formed from lava filling an underground fracture then resisting erosion better than the material around it did.
The dike extends from a volcanic peak (out of view here) called Shiprock in English and Tsé Bit'a'í, meaning "rock with wings," in the Navajo language. It offers an Earth analog for some larger hardened-lava walls on Mars, shown at <a href="//commons.wikimedia.org/wiki/File:PIA21264_-_Blade-Like_Martian_Walls_Outline_Polygons.jpg" title="File:PIA21264 - Blade-Like Martian Walls Outline Polygons.jpg">PIA21264</a>.
NASA/JPL-Caltech
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