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v0.31:Igneous extrusive layer

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This article is about an older version of DF.

Igneous extrusive stone layers are formed from andesite, basalt, dacite, obsidian, and rhyolite. Of these five, andesite, dacite, and rhyolite are functionally identical, different only in appearance and name, basalt is like the other three with the caveat that it is magma-safe, and obsidian is... unique.


Their name appears dark gray on the embark menu.

(In real world geology, igneous extrusive stone is formed by lava solidification on the surface, as opposed to igneous intrusive stone which forms below the surface. This is not true for Dwarf Fortress.)

Igneous extrusive layers[edit]

Stone found in igneous extrusive layers[edit]

Stone appearing in both igneous intrusive and igneous extrusive layers[edit]

Gems found in igneous extrusive layers[edit]

Gems appearing in both igneous intrusive and igneous extrusive layers[edit]

* See also: stone found everywhere

Sedimentary
Igneous
Intrusive
Extrusive
Metamorphic
Ore
Economic
Other