fan delta
geology
Quick Summary
A fan delta, also known as a delta fan, is a geological landform created where an alluvial fan merges with a delta. An alluvial fan is a cone-shaped deposit of sediment formed at the base of a mountain canyon where a stream's velocity decreases, causing it to deposit its load. These fans are common in arid and semiarid regions but can form in various climates. They are integral to erosional-depositional systems, where mountains erode and basins fill with sediment over geologic time.1234
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