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[Chattox]

You know how you get stone layers in an order, like, first soil, then limestone, then slate, then diorite, etc? Do layers near the top come round again further down?

I ask this because, due to lack of planning on my part, I used a lot of the limestone layers for building and only had one left for mining leaving me extremely short on fuel. I am loathe to mine around my existing fortress, it makes everything look ugly and confusing. I have 162 layers to go at underground, so surely layers must come round again.

Do I have any hope of another few limestone layers to mine for all they're worth?

[EmperorJon]

No, sedimentary is only near the surface.

[ferok]

I'm not exactly sure how to answer this...

Limestone is sedimentary.  In general, this is going to be near the surface.  Once you've hit diorite and slate, it's pretty safe to say that you wont find more sedimentary layers below them.  However, depending on your biome distribution, hills, and other factors, they may not extend the full width of the map so you may have luck in other areas.

Limestone is flux, and often contains malachite (iron).  It is also possible to find lignite and bituminous coal in limestone (like all other sedimentary layers) which can be made into coke (fuel), but Limestone is not, itself, fuel.

I hope that answers your question.  If not, see http://df.magmawiki.com/index.php/DF2010:Sedimentary_layer and http://df.magmawiki.com/index.php/Layer.

[Chattox]

That's annoying, I'm not going to find any more coal or lignite now. Trading and burning trees it is! Annoying.

[hiho216]

That's annoying, I'm not going to find any more coal or lignite now. Trading and burning trees it is! Annoying.

Maaaaaagma

[NecroRebel]

If you get confused by having the space around your fort mined out due to the fact that you have random open floors out there instead of black space, you could solve that problem by removing those floors, too. Having your fort hanging in a large open void is more aesthetically pleasing than having several layers of random floor symbols or + signs, and isn't very confusing as your eyes will slide past the dark-grey .s nearly as easily as the black squares.

[Chattox]

Wait, if layers don't repeat, what are the 162 levels below the surface in my fortress made from?

[Avo]

Stone, stone, more types of stone, Caverns, Caverns, Caverns, stone, stone, stone, Magma, Pain.

[Chattox]

Stone, stone, more types of stone, Caverns, Caverns, Caverns, stone, stone, stone, Magma, Pain.

Which types of stone, though?

[Avo]

That really depends on where you are, but your going to see igneous or metamorphic stones down below the first few layers.
http://df.magmawiki.com/index.php/Stone
We cant tell you exactly what your going to see, since dwarf fortress has random environments.

[Chattox]

So basically every kind of layer except sedimentary? Dammit, Dwarf Fortress

[Silophant]

Dammit, geology, more like.

Limestone is flux, and often contains malachite (iron).

Malachite is actually a copper ore.

[NecroRebel]

Usually, the surface layers are any of the 4 types of stone, but after a bit you stop getting sedimentary stones, then stop getting igneous extrusive, then finally metamorphic stones stop appearing somewhere between the third cavern layer and the magma sea. Below that point, there's only igneous intrusive stones, usually gabbro or basalt.