Couche Sédimentaire (sedimentary layer)

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Les couches de pierres sédimentaires contiennent de l'hématite, de la magnétite, de la tétraédrite, du charbon bitumeux, de la lignite et du gypse.

Les couches de craie*, chaille**, pierre argileuse, conglomérat, dolomite*, calcaire*, mudstone, pierre de sel, grès**, siltstone et schiste argileux sont sédimentaires.

^{(* Celles-ci peuvent servir de flux. ** Celles-ci sont à l'épreuve du magma.)}

Sedimentary layers are, on average, the most economically valuable of the four stone 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). They are much richer in iron ores than other rock formations. Several sedimentary rocks - dolomite, chalk, and limestone - are fluxes, required for steel-making and also being twice as valuable as normal stone, making them useful for trade goods or furniture.

Sedimentary layers can be tricky to locate. If you are starting off and you want access to an embark area with sedimentary layers, use the "Find Desirable Location" function before embark and set your parameters to include sites with flux stone. Since most flux stones are found in sedimentary layers, this will increase your chances that a suitable site will have sedimentary rock near the surface. Be careful when using the "Find Desirable Location" function as it will sometimes list green sites that have flux stone but it will not indicate that it does, actually, have flux stone.

(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.) Sedimentary layers

   Sandstone
   Siltstone
   Mudstone
   Shale
   Claystone
   Rock salt
   Limestone
   Conglomerate
   Dolomite
   Chert
   Chalk 

Stone found in sedimentary layers

   Hematite (veins)
   Limonite (veins)
   Bituminous coal (veins)
   Lignite (veins)
   Gypsum (large clusters)
   Jet (large clusters)
   Petrified wood (small clusters)
   Magnetite (large clusters)
   Bauxite (large clusters)
   Kaolinite (large clusters)
   Saltpeter (small clusters) 

Gems found in sedimentary layers

   Onyx (small clusters)
   Schorl (small clusters)
   Lace agate (small clusters)
   Bloodstone (small clusters)
   Moss agate (small clusters)
   Chrysoprase (small clusters)
   Sard (small clusters)
   Carnelian (small clusters)
   Banded agate (small clusters)
   Sardonyx (small clusters)
   Tube agate (small clusters)
   Fire agate (small clusters)
   Plume agate (small clusters)
   Brown jasper (small clusters)
   Picture jasper (small clusters)
   Yellow jasper (small clusters)
   Tigereye (small clusters)
   Tiger iron (small clusters)
   Clear tourmaline (small clusters)
   Gray chalcedony (small clusters)
   Dendritic agate (small clusters)
   White chalcedony (small clusters)
   Fortification agate (small clusters)
   Aventurine (small clusters)
   Indigo tourmaline (small clusters)
   Green tourmaline (small clusters)
   Red tourmaline (small clusters)
   Pink tourmaline (small clusters)