I...... experiencing this extremely strange aquifier layer on a new fort I generated.
Its an ocean fort, with two ocean biome bisected by a tropical forest biome that two squares into a 3 x 3 map. What I get is essentially one small hills with forest on the north of my map and a large hill on the south one z layer high, with two oceans on my left and right, connected by ten squares worth of beach with an ocean lake in the centre.
When I dug down, the aquifier doesn't appears to be in the forest biome, so, the centre and south of my map appears clear, however..... the aquifer shifts strangely on my east.... It moves back and forth, and extends multiple z levels down and is in my stone layers. The first stone layers were claystone, but even when the layers had shifted to bauxite, a gyspum cluster, microline..... the aquifer is still there. It extends into the caverns even, since some of the 1st cavern walls show damp sandstone.
Now, if its sandstone aquifer, it should show up as damp stone both above and below that layer, right?
The weird thing is that I have haematite, and bauxite, kaolinite, gyspum stone walls showing as DAMP. I thought those stones don't carry aquifer? I dug above and below those stone layers, but the aquifers shifts further east... then back west again, all on what I would had thought was unsuitable stones.
Right now, I have no idea how to exploit the aquifer. Hell, I don't even have any ideas on how to safely dig around the region anymore........ I literally have patches of sandstone showing up as aquifiers in the midst of diorite.........