I duplicated a ton of raws this time, including stone layers, body_default for some reason, and some creatures. Let's see.
Civilizations: Bronze Colossus, Cyclops, Minotaurs, Ettins, Giants. Not quite as amusing as unicorns and hydras, but eh.
Then I tried to look at a fairy megabeast, and the game crashed. Woooo. Legends Viewer works better anyway. This fairy breathes dragon fire and is still at large, undefeated.
Had two brook lamprey megabeasts. One died of old age without doing anything, the other spent all its time letting opponents escape and then died of old age.
Embarking with bronze colossi, with some blind cave ogre children as pets. Iron men are fish. All sand is generic "rock."
Upon embark... every ground tile that's not covered by grass is rapidly zooming through every possible type of stone in a strobe-light effect, wooooo. Walls are generic "rock" in some places, and regular stone/gems in others... ....that is a lot of galena. The entire top half of the mountain is almost solid galena.
Trying another embark location for somethin' possibly more intriguing than galena mountains, in a terrifying black-sand desert, we get... well, my wagon puller is a cap hopper. That's fun. Other than that, though, more "rock" wall and disco floors.
After regenning until I got a world that didn't have disco floors... I had two layers of native platinum. :3