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[Raphite1]

Originally:

                  <- surface
XXXXXXXX    <- clay
XXXXXXXX    <- black sand
XXXXXXXX    <- yellow sand (AQUIFER)

I performed the following works (W = water):

                 <- surface
X  XXXX  X   <- clay
X           X   <- black sand
XXWWWXX   <- yellow sand (AQUIFER)

The block of clay fell into the aquifer-pond as intended. However, the "plug" now appears to be yellow sand, not clay, and acts like an aquifer itself (fills with water when I try to dig through). The plug size is 12x12, and I tried to dig through the exact center.

I've plugged aquifers before without a problem.... what's going on here?


Edit: I tried a new staircase a couple tiles away from my original, and this time it went through without a problem. What the heck?

     When I dug the first staircase there was still 2/7 and 3/7 water swishing around from where the plug has displaced it from the layer below... maybe this somehow caused the plug tiles to bug and "think" that they were aquifer tiles?

[happydog23]

I haven't punched through any aquifers or done any major cave-in testing, but the second time you did a cave in, was it clay you dropped again?  or was it some kind of rock?  Maybe the clay doesn't leave anything behind since nothing can be "mined" from it

[Raphite1]

I didn't drop a second plug, I just tried digging through the same plug after the displaced water on top of it had dried up a bit more .....

...good..... god...

You know what? I bet the 2/7 and 3/7 water that my miners were wading through simply insta-filled my new staircases during my first attempt, and I just thought that the water was flowing in from the sides like an aquifer. Sigh.

[gtmattz]

You know what? I bet the 2/7 and 3/7 water that my miners were wading through simply insta-filled my new staircases during my first attempt, and I just thought that the water was flowing in from the sides like an aquifer. Sigh.

I was just about to reply to your OP with this suggestion, then decided to read through. 

What I did to resolve this when I tried out the cave in trick was to channel out a 'drain' back into the aquifer (since aquifers can absorb infinite water as well as produce it) off to the side so that the displaced water had somewhere to go, then waited for it to get down to 1's then made the stairs.

[Syff]

Lower-level soil-types transmogrifying collapsed higher-level soil-types has been documented before, and is not an entirely unreasonable possibility.