Where do the SB dungeons appear in DF?

For purposes of DF, do the SB dungeons appear in the leveling DF queue or the 50 and 60 DF queue? I would imagine leveling.

Pre 70 Leveling, others at 70 roulette and future expert.

Thanks. I figured that, but I was curious since I haven't queued into one yet through there. Perhaps because not enough players at them yet.