During heavy rains, temporary rivers move through dry valley from uplands into lowlands.
The rivers carry fine rock materials which are deposited where the dry valley enter a lowland.
As water reduces speed, the deposited materials form a cone-shaped depositional feature known as alluvial fan.
Due to more deposition, adjacent alluvial cones may join.
This leads to formation of a gentle sloping depositional surface called a bajada.
johnmulu answered the question on January 19, 2017 at 05:55
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