My new fortress is smack in the middle of 6 loving biomes.
In case you might be wondering what that might mean, visible precious treasures I've seen so far on the map: Copper, Tetrahedrite, Gold, Hematite (iron), Magnetite (more iron :P), Platinum, Aluminum.
Hell yeah.
There's also a magma vent somewhere underground (it was visible on the map, now I just need to find it)
No obsidian found as of yet though, so that's a bugger. There's no chasm either, or wildlife apparently. Apart from the lack of obsidian It's like a deserted paradise.