However, you always only get 1 layer of 1 sedimentary stone per region, so your embark should straddle different regions if you want more than 1 type of sedimentary stone on the map. Sedimentary stone can be found anywhere that doesn't have igneous extrusive, with varying probability. Low volcanism almost always leads to surface sedimentary stone, whereas medium-high volcanism often leads to surface metamorphic or igneous intrusive stone. The remaining 80% seems to be weighted or affected by other variables. As always, there is metamorphic and igneous intrusive stones deeper underground.Ģ. Some of the stone layers underground will also be igneous extrusive. The stone layer closest to the surface is always igneous extrusive here. The top 20% of volcanism leads to areas always having igneous extrusive.
#DWARF FORTRESS CAVERN LAYER FULL#
I repeated the prospecting with a world with full vanilla stones, and a world that had only one type of sedimentary.ġ. If I retested this, I would add a dozen metamorphic stones, but keep only 1 of each of the other stone types, to bias and reveal the presence of random selection at low volcanism. If your volcanic variance is high (perhaps to cause volcanoes to appear worldwide), this might cause regions to assume a higher or lower volcanism than you'd prefer. Due to max number of subregions or something, an region might look like it should contain a variety of layer types, but instead the entire region contains one set of layer types. mountain vs swamp), and is not related to stone types.ĥ. ALL sites in the world have metamorphic and igneous intrusive underground, below the variable surface layers.Ĥ. I GUESS that the game is randomly choosing from the available stone types, perhaps with some weighting.ģ. The logic here is a bit fuzzy and unknown. The remainder of the map (100-200 or the upper-middle 40%) can have sedimentary, or metamorphic, or igneous intrusive, but NOT igneous extrusive. After surveying the map, I observed that sites in the top 20% of volcanism (200-255) have igneous extrusive, and sites in the bottom 40% of volcanism have sedimentary (0-100).Ģ. (all results assume dfhack prospect is trustworthy)ġ.
I then used dfhack prospect to examine sites in the world and compare the layer stones to the volcanism levels from the map.
.jpg "dwarf fortress cavern layer")
The map had large blobs of light and dark, with grey shades in between. On the volcanism map, 255 (white) is high volcanic, whereas 0 (black) is low volcanic.
I then generated a world where the volcanic variance was low, and exported the volcanism map from legends mode. The sedimentary stone was also the only flux. These stones were renamed after their types to make reading dfhack easier. I made a copy of my DF 0.34.11 folder and removed most of the stone raws except for 1 layer stone of each type (sedimentary, metamorphic, igneous intrusive, and igneous extrusive).
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