What kind of beer do cavemen brew?

[the_trout]

http://www.bbc.co.uk/news/science-environment-13776499

I thought this was kinda cool. I wonder how much they knew about the process? I wonder if yeast was introduced purposefully or if they just got lucky with some wild strains blown on the wind?

 

[unionrdr]

Cool sight,savin it for later. But the iron age is by no means neolithic or even paleolithic. I have examples of both ages of artifacts stashed away.