I liked the original, I made my own take on it. It's work in progress but Patrick Stuart asked for options in randomizing subterranean worlds. Here's mine, you create this by rolling dice on a sheet of paper and then drawing on it:
Age of Formation
Roll 8 Dice:
1: Cave
2: Flooded Cave
3: Magma Chamber
4: Titan Bones
5: Gold
6: Rift between nearest 2
Water Flows.
Magma Flows.
Magma may erupt.
Roll 3 Dice:
1-2: Subterran River
3-5: Chasm
6: Subterran Lake
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Age of Great Ancients
