Uh, so I downloaded that first file, (the pre-embark map) and... well my world looks nothing like the two pictures.
Did the file change? Or.. what happened?
EDIT: Second file is correct world. First file seems to be a new world?
Well that's what I'd call a double derp. I've gone ahead and regenerated the world and updated the first save file. Let me know if you have any trouble finding the site. World gen parameters with seeds are included below.
Wow, what does your worldgen look like? Surely you're not using the default?
Nope, I designed this using advanced parameters - though I'm not using any mods.
[WORLD_GEN] [TITLE:FOO]
[SEED:95Cc7iEG6uf5v7DBf6Fa]
[HISTORY_SEED:ZEYJY4t24BN2HcxC1b9s]
[NAME_SEED:RP8Hx2jFPWB46BX7Pjn0]
[CREATURE_SEED:OvysiqMAGcAByHUQKzjO]
[DIM:129:129]
[EMBARK_POINTS:1274]
[END_YEAR:1050]
[BEAST_END_YEAR:200:80]
[REVEAL_ALL_HISTORY:1]
[CULL_HISTORICAL_FIGURES:1]
[ELEVATION:1:400:401:401]
[RAINFALL:0:100:200:200]
[TEMPERATURE:25:75:200:200]
[DRAINAGE:0:100:200:200]
[VOLCANISM:0:100:3200:3200]
[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:1:1:0:0:0:1]
[MINERAL_SCARCITY:250]
[MEGABEAST_CAP:18]
[SEMIMEGABEAST_CAP:37]
[TITAN_NUMBER:9]
[TITAN_ATTACK_TRIGGER:80:0:100000]
[DEMON_NUMBER:28]
[NIGHT_TROLL_NUMBER:14]
[BOGEYMAN_NUMBER:14]
[VAMPIRE_NUMBER:0]
[WEREBEAST_NUMBER:14]
[SECRET_NUMBER:28]
[REGIONAL_INTERACTION_NUMBER:28]
[DISTURBANCE_INTERACTION_NUMBER:28]
[EVIL_CLOUD_NUMBER:14]
[EVIL_RAIN_NUMBER:14]
[GOOD_SQ_COUNTS:25:251:503]
[EVIL_SQ_COUNTS:25:251:503]
[PEAK_NUMBER_MIN:12]
[PARTIAL_OCEAN_EDGE_MIN:0]
[COMPLETE_OCEAN_EDGE_MIN:0]
[VOLCANO_MIN:125]
[REGION_COUNTS:SWAMP:260:1:1]
[REGION_COUNTS:DESERT:260:1:1]
[REGION_COUNTS:FOREST:1040:3:3]
[REGION_COUNTS:MOUNTAINS:2080:2:2]
[REGION_COUNTS:OCEAN:2080:1:1]
[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:3500]
[CAVERN_LAYER_COUNT:3]
[CAVERN_LAYER_OPENNESS_MIN:60]
[CAVERN_LAYER_OPENNESS_MAX:100]
[CAVERN_LAYER_PASSAGE_DENSITY_MIN:0]
[CAVERN_LAYER_PASSAGE_DENSITY_MAX:45]
[CAVERN_LAYER_WATER_MIN:0]
[CAVERN_LAYER_WATER_MAX:100]
[HAVE_BOTTOM_LAYER_1:1]
[HAVE_BOTTOM_LAYER_2:1]
[LEVELS_ABOVE_GROUND:3]
[LEVELS_ABOVE_LAYER_1:15]
[LEVELS_ABOVE_LAYER_2:8]
[LEVELS_ABOVE_LAYER_3:8]
[LEVELS_ABOVE_LAYER_4:4]
[LEVELS_ABOVE_LAYER_5:10]
[LEVELS_AT_BOTTOM:25]
[CAVE_MIN_SIZE:5]
[CAVE_MAX_SIZE:25]
[MOUNTAIN_CAVE_MIN:25]
[NON_MOUNTAIN_CAVE_MIN:50]
[ALL_CAVES_VISIBLE:1]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:15]
[TOTAL_CIV_POPULATION:15000]
[SITE_CAP:1040]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:2080:4160:2080]
[RAIN_RANGES:2080:4160:2080]
[DRAINAGE_RANGES:2080:4160:2080]
[SAVAGERY_RANGES:2080:4160:2080]
[VOLCANISM_RANGES:2080:4160:2080]
The key items I modified are the Volcanism Frequency, Volcano Min, and Mineral Scarcity. The latter two are self explanatory; the reason I changed the first was to get fewer rejections with the high Volcano Min value, and to increase the likelihood of getting coal on a map with a volcano. I did get one world using default parameters that had a tiny bit of coal along with a volcano, but it was 5x5 and spanning three biomes, and the chances of getting another before my hair turns white is very low since coal cannot exist in areas with igneous rock.
I fiddled with the layers a little to reduce the number of z-levels, but it isn't especially relevant, so you can change that if you want a deeper world or 75 z-level candy towers. Ditto number of caves and visible caves.
EDIT: Interesting - regenerating the world seems to have added fire clay to the site. I always thought that generating a world with seeds would give you the same stuff, but it looks like the soil layer was switched here. Mineral distribution seems to be effectively the same.
And it looks like if you embark with the volcano in the top right square that it will trade down about 1000 units of candy in return for about 2000 units of platinum, if you're into that sort of thing.