A closer view of the supercritical climbing wind ripples that provide direct evidence of a sandstorm, roughly three and a half billion years ago. (IMAGE)

Geological Society of America

A closer view of the supercritical climbing wind ripples that provide direct evidence of a sandstorm, roughly three and a half billion years ago.

Caption

Fig 1: A closer view of the supercritical climbing wind ripples that provide direct evidence of a sandstorm, roughly three and a half billion years ago.

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NASA/JPL-Caltech/MSSS

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Credit NASA/JPL-Caltech/MSSS

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