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[Aqizzar]

That's the same region/biome/area thing highlighted in each shot.  One has three soil layers, the other has four layers and an aquifer, the only difference being the embark square is one column over.

[Dr. Melon]

Well, one of them is next to a river, and there just might be a lot of soil. I mean, where I live, there's 3 soil layers interspersed with 4 grit and sand layers before you hit rock.

[Nazush Ebsas]

Bet your dwarves get good farming!

[Deon]

Well, one of them is next to a river, and there just might be a lot of soil. I mean, where I live, there's 3 soil layers interspersed with 4 grit and sand layers before you hit rock.

But there's THE SAME biome. I thought layers and aquifiers belong to the whole biomes, not single tiles.

[Deathworks]

Hi!

I thought so, too. Does it change back and forth if you change the size back and forth or is it random? If the latter is the case, maybe the prospectors on the embark screen are not as precise as we always thought and have a margin of error (although missing an aquifer is a nasty mistake).

BTW, between the crashes/hangs in world generation (I had it freeze twice while saving map image and world info after generation, probably being overwhelmed by the list of rulers in a non-cleaned 5000 year world), I had the impression that aquifers have become quite common. Have other noticed this as well or was I just unlucky with my worlds?

Deathworks

[Sean Mirrsen]

Aquifers are sometimes wacky, even in the old version it was so. Sometimes you had a patch of dry land amidst an aquifer, sometimes you had a rogue aquifer patch where you didn't expect it. Maybe the game just tracks such occurences now?

[Aqizzar]

Ooookay... I tried embarking on the area I covered in the pics and DF crashed as soon as I hit Enter to confirm the aquifer.  I had already been playing one fortress which crumbled to it's end, and went strait for another embark, so that's another bug right there.  Then I restarted the program and embarking worked just fine - I'll bet it's failing to clear data or advance time or something.

As for the Schroedinger's Aquifer, I dug some holes and made some discoveries.  When I moved the embark area over a column (next to the river, though the map doesn't include the river) that caused the layer list to change.  There is indeed an aquifer in the eastern areas but not the rest of the map, even though the embark system considers it all one region.  I don't remember anything like that in 38c, but I do remember aquifers being incomplete in places.  Not having any utilities I can't just reveal everything to know what's going on here.

[korora]

I've seen a similar thing in 38c, one time I had to expand my embark area in order for one of the biomes (that was already partially in the embark area) to gain sand.

[Exponent]

Indeed.  I usually start with a large embark rectangle in order to see all the different biomes a certain area provides.  If I find one I like, I shrink down the rectangle to a reasonable size.  Sometimes certain biomes lose some of their layers, if I'm only including a small portion of them in the final rectangle.  That's thrown me off at least a couple times in the past.

[Toady One]

The number of soil layers depends on the exact elevation which might account for the change, though I'm not sure if it's picking that up from the upper left corner of your rectangle or the least elevation in your rectangle.  Of course, if there are seeds, and there probably are, where the aquifer readout still doesn't match reality, I can take a look at them.  And if the crash reproduces in that seed in 39b or in another like it (or did 39b kill seeds?), I'd like to take a look at it too.

[Granite26]

I'm seeing this in [40d] here :

[SEED:1749346575] [HISTORY_SEED:3061036161] [NAME_SEED:1528795001]

Save is available.

I've dug out a crosshatch pattern on the first two z-levels (one is sand, and the second rhyolite) and the aquifer on the sand z-level is missing.

**Save and images available**

[Toady One]

Yeah, I can use that.  I can get the embark location from the save, but it's easiest with an embark image for the location if there is one.  What world size did you use (again, it's in the save, but for an embark error it's easiest to start from the world and re-do the embark)?

[Granite26]

[WORLD_GEN]
   [TITLE:NEW]
   [SEED:1749346575]
   [HISTORY_SEED:3061036161]
   [NAME_SEED:1528795001]
   [DIM:129:129]

(It's a standard medium world.  The new was just me trying to regen based on the seed.)

Savefile : I've included the worldgen info in this as well.

[Toady One]

Okay, I've grabbed the file and folded this into the Bug 865 report notes.