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Difference between revisions of "40d:Sedimentary layer"
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[[bituminous coal]], and [[lignite]]. | [[bituminous coal]], and [[lignite]]. | ||
| − | [[ | + | [[Chalk]]*, [[chert]], [[claystone]], [[conglomerate]], [[dolomite]]*, [[flint]], [[limestone]]*, [[mudstone]], [[rock salt]], [[sandstone]], [[siltstone]] and [[shale]] layers are sedimentary. |
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| + | <nowiki>*</nowiki><small> these also function as [[flux]]</small> | ||
The name of a sedimentary layer appears white on the embark menu. | The name of a sedimentary layer appears white on the embark menu. | ||
Revision as of 11:26, 24 August 2009
Sedimentary stone layers contain hematite, limonite, magnetite, tetrahedrite, bituminous coal, and lignite.
Chalk*, chert, claystone, conglomerate, dolomite*, flint, limestone*, mudstone, rock salt, sandstone, siltstone and shale layers are sedimentary.
* these also function as flux
The name of a sedimentary layer appears white on the embark menu.
Sedimentary layers are, on average, the most economically valuable of the five mineral layers. They are your only source of bituminous coal and lignite, vital for fueling non-magma forges and for the coke steel-making requires (especially if you lack trees). Even if magma is present, only sedimentary layers contain bauxite, the only rock and mechanism (other than Hidden Fun Stuff) which can withstand the heat of magma. They are much richer in iron ores than other rock formations. Several sedimentary rocks - dolomite, chalk, and limestone - are fluxes, required to make steel and also of double value when turned into trade goods or furniture.
(In real world geology, sedimentary stone is formed by sediment. The sediment collects in constantly growing heaps and the pressure at the bottom eventually forms the sediment into stone. This is not true for Dwarf Fortress.)