the one i found was at x -5, z 1954
found these VERY weird things in it things who's description remind me of the Mystcraft "Age" system for generating worlds....
The little blue dimlet things? Yes, I've had a few stacks of them on some play throughs. I think that portion of RF tools has been disabled, the one that lets you create dimensions. I had trouble finding a recipe for things you needed to make them in NEI.