Also just made the connection that the idea of "newbie zone" ZEM that I keep seeing popping up is just people getting the level 1-6 newbie ZEM and not realizing it. That explains that little bit of weirdness in the old posts very cleanly.
Another tweak to the above list by the way, looks like LOIO ZEM was nerfed from 100 to 75 in the same January 2001 patch that raised the dungeon ZEMs, per this post:
https://groups.google.com/d/msg/alt....U/OnSctcl_2x4J
Although this one says Feb 2001 (that's where I got the original date from):
https://groups.google.com/d/msg/alt....E/rL8k_44W2V0J
It's one of those two, anyways.