At Michigan State all of the geology grad students go to the same bar every Friday. And at Miami's Geology Field Station there's a bar less than a mile away. That bar is in the middle of nowhere so it must be the Geologists and oil field workers who keep it going.
Dr. Maltman from the University of Wales at Aberystwyth discussed the role of Beer and Geology at the GSA conference in Denver. It appears this discussion was taken from his article in Geology Today titled ‘Wine, beer and whisky: the role of geology’ . Most newspaper articles about the presentation at the GSA conference discussed the strong connection between beer and the rocks the groundwater flows through and discounted the concept of terroir in wine.
However, this may be because the effects of terroir have not been fully investigated. But there is no doubt that groundwater and hence geology has a tremendous impact on beer. And the difference can be as subtle as noticing a difference of taste between Guinness brewed in London and Guinness brewed in Dublin. Along these lines some brewers are reviving "geologic brewing methods".