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40d:Stone layers
There are four layers of stone in Dwarf Fortress. Each has different types of of ore and gems available.
Sedimentary
Appears in a lighter shade on the embark menu. Often includes coal, iron ore, and flux, all the components for making steel. Never found in the same biome as igneous extrusive.
Metamorphic
Contains a small variety of ores, but tends to be rich in gems. Includes marble, which makes an easy to find flux.
Igneous Extrusive
Appears in a darker shade on the embark menu. It is likely to include obsidian and metal ores. It also indicates a good chance of magma being present in some form or another. Never found in the same biome as sedimentary.
Igneous Intrusive
Often contains gold or copper ore.
Other Layers
Soil
Appears in brown on the embark menu. Useful for growing crops, but provides no rock for building.
Magma
Not visible on the embark menu, unless you build directly on a volcano. Both useful and dangerous.
Aquifer
Appears as wavy blue lines on the embark menu. This layer of wet stone can be used as a water source, but acts as a barrier to layers below it.