Well, not exactly Jurassic, but close. There's a great article in today's Washington Post about beer made from a truly ancient yeast -- in the vicinity of 25-45 million years old. The Post piece requires registration/sign-in, but I googled around and found some other reports. Here's one, and here's a report from Bill Brands, who had a chance to taste the beer. Still more info here at the site of the company that's brewing up this Ancient Ale.