Here's the back cover blurb:
A roleplaying game of prehistoric disaster prevention.
Back at the dawn of civilization, a growing town is threatened by three terrible catastrophes. You will play the part of glory-seeking heroes and bickering town elders as you attempt to save the town.
The game requires no pre-game preparation aside from reading the rules and rotates the gamemastering duties.
You can check out a copy at Generic Games if you want to read it.