I'm going through the flevel.lgp right now, you know, just a saucy lil' weekend at home. Found something interesting - the
anfrst fields (aka the Ancient Forest that you can access via green/black/gold chocobo or after defeating Ultima Weapon) was placed in the game between the
slfrst fields (the Sleeping Forest) and the
sango fields (the Corral Valley). The reason I mention this is because the field data in flevel.lgp appears in clusters, with the side dungeons clustered together before plot content, after which point the fields are listed in order of appearance. To me, this could indicate that the Ancient Forest was originally intended as an extended middle segment of the Sleeping Forest dungeon, and then was changed to side content late in development. Not a sure thing, but I think it counts as what-the-fuckery