A fan-shaped mass of alluvium deposited as the flow of a river decreases in velocity.
- Water-transported sediments formed alluvial fan deposits that were laid down on essentially flat-lying volcanic flows by streams flowing toward the center of the rift basin.
- The Copper River alluvial fan is an outwash plain, that is, formed from sediments deposited by glacial meltwater.
- Deposits in the Solund Basin consist almost entirely of alluvial fan conglomerates.
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