The Tribe of Ogg and the Gift of Suss is a free 0-level DCC-RPG module set in a prehistoric time. Stay tuned for more free prehistoric stuff, because Daniel's module, along with +Michael Curtis' Frozen in Time inspired my home crew enough that I wrote out a fairly detailed cosmology, with patrons, spells, and a couple more adventures (other than Steading of the Nergalites...)
Get the PDF:
And here's a better quality map for the adventure area...
And the Gift of Suss!