Alright. This is a relatively interesting embark.
I embarked on a volcano, hoping to get some easy to use magma along with the clay that was there to get a serious clay industry going. When I embarked, I received massive lag. Eventually, it stopped and I could actually unpause the game. I then start receiving cave in warnings from about 55 z levels below the surface. The game is basically unplayable, so I break out DFhack and reveal the map.
Turns out, my third cavern is basically hell. Half of it has a slade floor, the magma sea is pouring into the pits, and the semi molten rock is actually under some of the slade areas. Can't quite figure out how to upload pictures, but heres the seed info.
Created in DF v0.31.21.
[WORLD_GEN]
[TITLE:TALL]
[SEED:3310762457]
[HISTORY_SEED:4010869939]
[NAME_SEED:3018783377]
[CREATURE_SEED:2840217699]
[DIM:17:257]
[EMBARK_POINTS:1274]
[END_YEAR:1050]
[BEAST_END_YEAR:200:80]
[REVEAL_ALL_HISTORY:1]
[CULL_HISTORICAL_FIGURES:0]
[ELEVATION:1:400:52:800]
[RAINFALL:0:100:26:400]
[TEMPERATURE:25:75:26:400]
[DRAINAGE:0:100:26:400]
[VOLCANISM:0:100:26:400]
[SAVAGERY:0:100:26:400]
[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]
[MINERAL_SCARCITY:2500]
[MEGABEAST_CAP:4]
[SEMIMEGABEAST_CAP:9]
[TITAN_NUMBER:3]
[TITAN_ATTACK_TRIGGER:80:0:100000]
[DEMON_NUMBER:22]
[NIGHT_CREATURE_NUMBER:22]
[GOOD_SQ_COUNTS:6:66:132]
[EVIL_SQ_COUNTS:6:66:132]
[PEAK_NUMBER_MIN:3]
[PARTIAL_OCEAN_EDGE_MIN:1]
[COMPLETE_OCEAN_EDGE_MIN:0]
[VOLCANO_MIN:50]
[REGION_COUNTS:SWAMP:68:0:0]
[REGION_COUNTS:DESERT:68:0:0]
[REGION_COUNTS:FOREST:273:0:0]
[REGION_COUNTS:MOUNTAINS:546:0:0]
[REGION_COUNTS:OCEAN:546:0:0]
[REGION_COUNTS:GLACIER:0:0:0]
[REGION_COUNTS:TUNDRA:0:0:0]
[REGION_COUNTS:GRASSLAND:546:0:0]
[REGION_COUNTS:HILLS:546:0:0]
[EROSION_CYCLE_COUNT:250]
[RIVER_MINS:26:26]
[PERIODICALLY_ERODE_EXTREMES:1]
[OROGRAPHIC_PRECIPITATION:1]
[SUBREGION_MAX:2750]
[CAVERN_LAYER_COUNT:3]
[CAVERN_LAYER_OPENNESS_MIN:0]
[CAVERN_LAYER_OPENNESS_MAX:100]
[CAVERN_LAYER_PASSAGE_DENSITY_MIN:0]
[CAVERN_LAYER_PASSAGE_DENSITY_MAX:0]
[CAVERN_LAYER_WATER_MIN:0]
[CAVERN_LAYER_WATER_MAX:100]
[HAVE_BOTTOM_LAYER_1:1]
[HAVE_BOTTOM_LAYER_2:1]
[LEVELS_ABOVE_GROUND:15]
[LEVELS_ABOVE_LAYER_1:5]
[LEVELS_ABOVE_LAYER_2:1]
[LEVELS_ABOVE_LAYER_3:1]
[LEVELS_ABOVE_LAYER_4:1]
[LEVELS_ABOVE_LAYER_5:2]
[LEVELS_AT_BOTTOM:1]
[CAVE_MIN_SIZE:5]
[CAVE_MAX_SIZE:25]
[MOUNTAIN_CAVE_MIN:6]
[NON_MOUNTAIN_CAVE_MIN:13]
[ALL_CAVES_VISIBLE:0]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:40]
[TOTAL_CIV_POPULATION:15000]
[SITE_CAP:273]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:546:1092:546]
[RAIN_RANGES:546:1092:546]
[DRAINAGE_RANGES:546:1092:546]
[SAVAGERY_RANGES:546:1092:546]
[VOLCANISM_RANGES:546:1092:546]
Interestingly, there is magma within slade walls, creating an area where its 7/7 magma and slade wall. If your looking for it, its up north, near a stream/brook. Look for a 3*3 area of massive slopes on a volcano next to a stream.
As for the discussion, how many other odd areas like this have been found? Any thing I can do to fix this?