Sedimentary layer

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Layers of sedimentary rock in Makhtesh Ramon.

Sedimentary stone layers contain hematite, limonite, magnetite, tetrahedrite, bituminous coal, lignite, and gypsum. Chalk*, chert**, claystone, conglomerate, dolomite*/**, limestone*, mudstone, rock salt, sandstone**, siltstone and shale layers are sedimentary.

^{(* These also function as flux. **These are also magma-safe.)}

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 that 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 not indicate that it does, actually, have flux stone. To find iron ores, search for a location that has flux stone, medium elevation, and either high or low drainage. On large maps, the ore is sometimes located near mountains and major rivers in large (min ~10x10) chunks.

Alternatively, a mountain biome that has an aquifer is guaranteed to be sedimentary as well, due to mountains lacking soil, which means the aquifer must be in sedimentary layers.

If your embark civilization has access to sedimentary layer stones when preparing, it is likely one or more of the biomes in their sites overlap a biome containing it.

(In real-world geology, sedimentary stone is formed by sediment, which gets carried away by rivers and deposited in constantly-growing heaps, where 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)

* See also: stone found everywhere

V · T · E Stones
Sedimentary	Calcite · Chalk · Chert · Claystone · Conglomerate · Dolomite · Limestone · Mudstone · Rock salt · Sandstone · Shale · Siltstone
Igneous	Intrusive Diorite · Gabbro · Granite Extrusive Andesite · Basalt · Dacite · Obsidian · Rhyolite
Metamorphic	Gneiss · Marble  · Phyllite · Quartzite · Schist · Slate
Ore	Adamantine, raw · Aluminum, native · Bismuthinite · Cassiterite · Copper, native · Galena · Garnierite · Gold, native · Hematite · Horn silver · Limonite · Magnetite · Malachite · Platinum, native · Silver, native · Sphalerite · Tetrahedrite
Economic	Alabaster · Bituminous coal · Calcite · Gypsum · Kaolinite · Lignite · Satinspar · Selenite
Other	Alunite · Anhydrite · Bauxite · Borax · Brimstone · Chromite · Cinnabar · Cobaltite · Cryolite · Graphite · Hornblende · Ilmenite · Jet · Kimberlite · Marcasite · Mica · Microcline · Olivine · Orpiment · Orthoclase · Periclase · Petrified wood · Pitchblende · Puddingstone · Pyrolusite · Realgar · Rutile · Saltpeter · Serpentine · Slade · Stibnite · Sylvite · Talc