Reference, where art thou?

Besides The Quest for Fire, The Clan of the Cave Bear series, and an adventure from GURPS Ice Age, I don't actually have much media reference for a prehistoric game. Oh, wait, and 10,000 B.C.

I dunno, I feel like there might be inspiration for some of my encounters hidden somewhere in the media's Ice Age. Or maybe even outside of it, particularly for the bits I'm having the most trouble with. Political intrigue? I think there are some RPG books for that. Overcome the obstacle of a ruined city overrun by enemies? I Am Legend comes to mind, as does The Day After Tomorrow, if only for the weather imagery. So, my question is: Where would you look for inspiration?

P.S. - The Many Colored Land is not something I wish to plow back into, nor did I find Thomas Covenant or whatever his name was particularly interesting. Just sayin'.