So, I find a really nice site. Aquifier, volcano, sand, all civilizations, a brook, the works.
I embark, and find that the volcano isn't breaking through to the surface. Well, that's not a problem. I channel the top of the mountain randomly for a while, but eventually get fed up and use 3dwarf to look around. I find the underground magma (there's the red liquid texture), and notice that aside from the volcano, there's a cave river and nothing else.
I dig into the mountain, and eventually find where the volcano should be. Except digging into the side reveals one of those circular chasms (with the appropriate message for discovering a chasm). No lava in sight. Exporting *this* map to 3dwarf creates a map with no magma showing in the chasm.
So, are volcanoes supposed to go extinct during worldgen? It would be really neat if true, but there should probably be distinction between active and extinct volcanoes in that case.
Here's a picture of my exact location,
and here's my seed data:
Created in DF v0.28.181.39c.
[WORLD_GEN]
[TITLE:GLASSLIDE]
[SEED:3528688553]
[HISTORY_SEED:2252898000]
[NAME_SEED:2583712320]
[DIM:129:129]
[END_YEAR:1050]
[BEAST_END_YEAR:200:80]
[END_YEAR:1050]
[REVEAL_ALL_HISTORY:1]
[CULL_HISTORICAL_FIGURES:0]
[ELEVATION:1:400:1600:1600]
[RAINFALL:0:100:200:200]
[TEMPERATURE:25:75:200:200]
[DRAINAGE:0:100:200:200]
[VOLCANISM:15:100:200:200]
[SAVAGERY:0:100:200:200]
[ELEVATION_FREQUENCY:1:1:1:1:1:1]
[RAIN_FREQUENCY:1:1:1:1:1:1]
[DRAINAGE_FREQUENCY:1:1:1:1:1:1]
[TEMPERATURE_FREQUENCY:1:1:1:1:1:1]
[SAVAGERY_FREQUENCY:1:1:1:1:1:1]
[VOLCANISM_FREQUENCY:1:1:1:1:1:1]
[GOOD_SQ_COUNTS:0:0:0]
[EVIL_SQ_COUNTS:0:0:0]
[PEAK_NUMBER_MIN:12]
[OCEAN_EDGE_MIN:1]
[VOLCANO_MIN:150]
[REGION_COUNTS:SWAMP:0:0:0]
[REGION_COUNTS:DESERT:0:0:0]
[REGION_COUNTS:FOREST:0:0:0]
[REGION_COUNTS:MOUNTAINS:0:0:0]
[REGION_COUNTS:OCEAN:0:0:0]
[REGION_COUNTS:GLACIER:0:0:0]
[REGION_COUNTS:TUNDRA:0:0:0]
[REGION_COUNTS:GRASSLAND:2080:3:3]
[REGION_COUNTS:HILLS:2080:3:3]
[EROSION_CYCLE_COUNT:250]
[RIVER_MINS:100:100]
[PERIODICALLY_ERODE_EXTREMES:1]
[OROGRAPHIC_PRECIPITATION:1]
[SUBREGION_MAX:2750]
[CAVE_MAX_SIZE:25]
[MOUNTAIN_CAVE_MIN:25]
[NON_MOUNTAIN_CAVE_MIN:50]
[ALL_CAVES_VISIBLE:1]
[TOTAL_CIV_NUMBER:20]
[TOTAL_CIV_POPULATION:20000]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:0:0:0]
[RAIN_RANGES:2080:4160:2080]
[DRAINAGE_RANGES:2080:4160:2080]
[SAVAGERY_RANGES:2080:4160:2080]
[VOLCANISM_RANGES:0:0:4080]
I have a savegame, if you want it.
Sorry to be such a bother with all these bug reports... I wish I could be more helpful.
EDIT: Well, looks like it was either an issue with 3dwarf (I could have sworn it showed magma in both) or I was just lax and wasted everyone's time. Sorry.