What process allowed the ancient riverbeds (inverted ridges) to remain visible today?

Answer

The channels were filled with sediment that hardened, forming a rock layer more resistant to erosion than the surrounding terrain

This preservation mechanism occurred because the river channels were filled with sediment that later hardened, creating a rock layer that resisted subsequent erosion from wind better than the adjacent material.

What process allowed the ancient riverbeds (inverted ridges) to remain visible today?

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