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[Gutanoth]

Does anyone else find embarks with marble listed in the layers when over a volcano, but when they dig into the earth they can't find anything of the sort?

[Diacritic]

Er, no, but I embarked on a volcano with no flux listed and found marble at the bottom of it.

Maybe I got your marble?

[Gutanoth]

zomg, stealz!
but what do you mean by the bottom?

[Daetrin]

It's entirely possible the marble is in a small biome on the corner of the map.

[Diacritic]

By "at the bottom", I mean I found marble by looking down into the volcano pipe until I saw it, two Zs above the magma sea, and then I ran exploratory stairs down until I found the stuff and mined it out.

[Gutanoth]

wow. that really is bottom. but aren't volcano pipes surrounded on all sides my obsidian?

[thijser]

Well I recently embarked on a volcano listed with a large (x2) marble layer covering roughly 3/4 of my embark map and using df hack I saw that there was no marble at all. It was a rather strange embark anyway with a over 30 z-level  cavern. And even a weird freezing thing with one area that doesn't freeze one area that's mostly frozen (from mid spring to mid autum).

[GaxkangtheUnbound]

I found marble, diorite, and or rocks ON A BEACH!
The presence of a volcano may have contributed, though.

[Urist Imiknorris]

Metamorphic (like marble) and igneous intrusive (like diorite) rocks are everywhere.

[Ragingpantsless]

I've had this sort of thing happen before, but trust me it's there. Use exploratory mining to search over large areas, marble doesn't like to hide in small clusters.

[derekiv]

I once found marble 10 z up the volcano.It was nice, my dwarves got to carry stones down stairs for once. Then all the way to the top of the volcano for the forges 

[krenshala]

I once found marble 10 z up the volcano.It was nice, my dwarves got to carry stones down stairs for once. Then all the way to the top of the volcano for the forges 

You should have just extended your stairs up a bit further, then.

[FleshForge]

There is almost always some marble around magma areas, whether volcano or the bottom layers - not always, but I'd say 90% of the time or so.

[Vercingetorix]

Yeah, marble usually shows up in pockets rather than whole layers on volcanoes; a lot of the time, on both volcano and non-volcano maps it seems to be clustered around bodies of water in the caverns (even on maps without a marble layer).

[gtmattz]

Yeah, marble usually shows up in pockets rather than whole layers on volcanoes; a lot of the time, on both volcano and non-volcano maps it seems to be clustered around bodies of water in the caverns (even on maps without a marble layer).

Marble never ever shows up as clusters, what you are seeing as clusters is displacement caused by terrain elevation changes transposed down to the layers where the marble is appearing.  Marble is a layer stone, and as such only shows up as a layer with clusters and veins of other stone inside of it.  When something like a volcano causes drastic z level changes, the shape is transposed through all the layers, so it may look like that marble is in a cluster, but its not, it is just that the layers that the marble makes up are all 'chopped up' and spread across multiple z levels instead of a nice flat layer like you would find if you embarked on a flat region.