Stone layers

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In Underdog, there are layers of stone that generate depending on biomes.

• Igneous Extrusive:
  Andesite, Basalt
  (Top)

• Igneous Intrusive:
  Diorite, Granite, Gabbro
  (Bottom)

• Metamorphic:
  Quartzite, Marble, Slate
  (Middle)

• Sedimentary:
  Dolomite, Limestone, Sandstone
  (Middle)