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I have a big area I have already dug which I'd like to split into two sub area. Would it be possible to do that without the use of walls? I mean for instance just adding rough clay?

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I'm sorry, I'm not entirely sure what you mean by 'sub areas' in this context. You can build walls from rough stones or any kind of block you're capable of making - stone, wood, clay, metal, the works... –  Shadur Feb 16 '13 at 18:28
    
Please give your question a descriptive title. –  kotekzot Feb 16 '13 at 18:32
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You can only fill space with constructions. Since there's no way to place natural stone and earth, once you've dug an area out, you can only refill space you dug out by ordering constructions like walls and fortifications to be built.

Actually, there are two alternatives to constructions that are especially dwarfly and are much more Fun™, but require enough additional work that you are probably not looking for this sort of thing. For completeness though, you can:

  • Fill the area with obsidian. Flood the area with lava, then water. The obsidian will count as "natural" since it was formed, not constructed, but if you're looking for earth or stone this wont help. Also note that unless the area is impeccably sealed off, dwarfs have a tendency to go for a swim in the lava for Fun™.

  • Drop a suspended layer of earth/stone into the spot you want filled. A layer of natural material that is completely separated from the surrounding material (beside, above, and below) that collapses all at once will simply fill the space below instead of pulverising into rubble. To achieve a perfect collapse you can keep the layer connected to solid ground above via a Support – connect a lever on that support, and when a dwarf pulls it the support will vanish, dropping the chunk. As an engineering task this is quite the challenge if you've never done it before, but has the benefit of being a nice practice project for punching through aquifers. Dwarfs have a tendency to stand in exactly the wrong spot when the detracted layer drops, so make sure you have a "functioning" hospital before pulling the lever.

  • Using magma to melt ice in freezing terrain, pump the water where you want it to make a wall, and then pumping away the magma to let the water freeze into ice. An excellent exercise for learning about the uses, features, and dangers of freezing temperatures. Also an excellent exercise for learning about magma-safe materials. (Dwarfs are not made of magma-safe materials.)

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technically you can pour in lava and water to create obsidian... –  ratchet freak Feb 16 '13 at 21:32
    
Also makes for good traps. –  Shadur Feb 16 '13 at 22:01
    
Right! I'll add that. –  SevenSidedDie Feb 16 '13 at 22:36
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Ice is also a possibility for a natural wall, on the right map. The best case is a permanently freezing map, where you can pipe magma near ice to melt it, pump that water into place, and then drain the magma so it freezes again. –  Samthere Mar 20 '13 at 14:31
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+1 Dwarfs are not made of magma-safe materials. –  Sconibulus Mar 20 '13 at 14:56
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