Trio of 'black mesas' leftover from Paleozoic era spawn...

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2025-12-02 09:00:14

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Trio of 'black mesas' leftover from Paleozoic era spawn rare sand dunes in the Sahara Earth from space

A 2023 astronaut photo shows three dark hills, or mesas, towering above part of the Sahara desert in southern Mauritania. The structures are remnants of a single Paleozoic era formation, and have helped to create a series of striking sand dunes.

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