Ok, that last one with the skalligators (mmh, like that word) crumbled to it's tantrummy death after a little cave-in accident. Undead monsters are no danger at all, compared to dwarven stupidity.
The next one got an interesting start. A 5*5 site with a brook through the middle with magma pipe
and pool on one side and some hills with an underground river on the other. Some trees on the surface, but not enough to block caravans, and the first stuff my miners hit after striking the earth and digging straight down were (in that order): yellow sand, magnetite, dolomite with a vein of bituminous coal, another cluster of magnetite and below that some bauxite. Hell yeah

Would it be possible, that modding all the useless big-cluster stones like orthoclase or microcline to be small cluster, made the other big clusters (magnetite, bauxite) way more frequent? I have that nagging feeling, there's something wrong since I made these changes to the raws...