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Alluvial layer

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This article is about the current version of DF.
Note that some content may still need to be updated.

An alluvial layer of land in Canyon State Park.

Several minerals, ores, and gems are specified to occur at least in part within alluvial layers. Alluvial stone is loose and unconsolidated stone that has been eroded away, smoothed down by water flow, and then redeposited in a non-marine setting. In Dwarf Fortress, all sedimentary layers are capable of containing alluvial deposits.

Whether or not a particular stone, gem, or ore appears in the alluvial layer is controlled by the [ENVIRONMENT:ALLUVIAL:...] tag in its raw files. Alluvial environments can contain clusters of: