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[San-A]

I don't know if that's a bug, but every time I embark on a map with a volcano, the crater has a very weird shape. Actually it looks like a gigantic tube that ends several z-level above ground.

Here is an example (the light blue corresponds to open air)

http://imageshack.us/photo/my-images/717/volcanox.png/
Is it a bug?

Thanks!

[Minnakht]

I wouldn't really call it a bug, more of an interesting geological feature of DF. Basically, volcanoes in DF are just what we call a 'magma tube' - a roughly round shaft of magma cased in obsidian - breaking through to the surface. Normally, it would end more properly where a mountain ends, but this one decided to stick higher up. That's because Toady is doing a lot as he is and making magma tubes always end where the ground ends wasn't something he could achieve with as much effort as he put into it.

[San-A]

I wouldn't really call it a bug, more of an interesting geological feature of DF. Basically, volcanoes in DF are just what we call a 'magma tube' - a roughly round shaft of magma cased in obsidian - breaking through to the surface. Normally, it would end more properly where a mountain ends, but this one decided to stick higher up. That's because Toady is doing a lot as he is and making magma tubes always end where the ground ends wasn't something he could achieve with as much effort as he put into it.

Makes perfect sense to me. Thanks!

[weenog]

Look at it this way: If the top of the volcano is higher up than everything else in the location, it should be very simple (though not trivial) to construct and fill a magma reservoir in the sky that drops magma wherever you want it.