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I got tired of seeing that lava almost never has a sed layer around it. So I decided to try this util.
I'm running 38a and hexedited it with the values that the talk page gave, but no magma/lava appears at the square I'm loo[k]ing at.
Has anyone ever tried to use it with 38a?
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i admit my geology is pretty bad, but shouldnt lava tubes be surrounded by volcanic rock?
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I think one of the main places sedimentary rocks usually form is around water. I'd poke around looking for lava tubes near large bodies of water - lakes and rivers. You probably won't get limestone *right* next to the tube, but you might get them in adjacent biomes. That said, I've only ever seen the combination together once.
EDIT: This is a guess which may or may not work. I've got nothing really to go on here but a vague recollection of a lecture on geology some ten years back.
[ March 28, 2008: Message edited by: bigmcstrongmuscle ]
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I've done quite a lot of searching for sites with both magma and sedimentary layers. From what I can gather, magma pipes or lakes appear only in regions with igneous extrusive stone layers (the wiki agrees). That is, if the smallest map in the site selection screen has some biome with a dark stone layer, there might be magma somewhere in the region. On the other hand the placement of magma within the region doesn't seem to be affected by the stone layers, so I think it's possible to find a magma formation in the middle of a sedimentary layer. Anyway, your best bet is to look for the boundaries of sedimentary and igneous extrusive layers on the world map. Good sites with both magma and sedimentary layers are still quite rare, though, but I believe looking for the layer boundaries narrows down the search as much as possible.
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what about using the cheat program to find a spot with both a cave river and a lava tube? do cave rivers still have limestone walls? I havent found one in the 3d versions yet...
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When I go looking for magma with sedementary rock, my process is to find a volcano, then look at the neighboring squares to see if any of the nearby biomes have sedementary rock. If they do, then I look for a magma pipe; zones near volcanos are more likely to have them.
I don't think I've yet seen a volcano that was itself in sedementary rock, but as long as it's nearby, you can always just make a long tunnel to the edge of the volcano so you have your magma available. Usually you don't need large quantities of magma - just enough to drive your smelters and forges - so it's not a big deal if the magma's far from your actual fort.