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While petrified sand dunes can be found in the American Southwest, these ones were spotted a little farther from home — on the lower slopes of Mount Sharp on Mars..
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Large-scale crossbedding in the sandstone of this ridge on a lower slope of Mars’ Mount Sharp is common in petrified sand dunes. JPL / NASA
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Sep 24, 2015 @ 04:57:35
Reblogged this on James' World.
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