40d: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, felsite, obsidian, and rhyolite. Of these five, all but obsidian are absolutely identical within the game (distinguished only by their names and their un-mined presentation on the map.)

Their name appears dark gray on the embark menu. They also indicate a good chance of magma being present nearby in some form or another.

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

In the real world[edit]

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.)