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40d:Igneous extrusive layer
Igneous extrusive stone layers are Andesite, Basalt, Felsite, Obsidian, and Rhyolite.
They usually contain Hematite, Gold, Copper, Tetrahedrite, and Native Aluminum.
Their name appears in a darker shade on the embark menu. They also indicate a good chance of magma being present in some form or another.
(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.)