Thanks! Looks like the town name is indicative of what texture/color the rock is, rather than what city you're around.
I think there will be other types that are named after areas famous for that type of rock, i.e. lava type (Dralk),different colors of rock (red/brown) etc...
It might only give you theoption of using the local rock type, so you may not get tosee the other types unless you move around a bit.
I haven't looked into lairs yet, so will know more later.