According to research just published in the Journal of Geophysical Research, the remains of hundreds of ancient sand dunes partially cemented by water action have been discovered in the Hellas Basin and Noctis Labyrinthus.
The floods that invaded these ancient sand dunes occurred about 2 billion years ago, contributing to the partial cementing of the base of the dunes.
These remnants of ancient dunes provide us with important information about the prevailing wind direction at that time and may also preserve the remains of ancient life forms that were trapped during the cementing process of the dunes themselves….
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