Wilderness, Prehistoric:
1 check / 24 hours: Roll 1-D20 -- Roll needed for encounter: 16+
%Roll: Encounter types:
01-15: Ankylosaurus
16-30: Bear, Cave
31-48: Cat, Saber-toothed Tiger
49-53: Character G.M.: Pre-make all NPC character encounters.
54-61: Elephant, Wooly Mammoth
62-63: Jahtha
64-65: Jahthein
66-75: Megatherium
76-77: Nature
78-79: Race
80-00: Tyrannosaurus Rex