If you have some extra time on your trip to the Bristlecone Pines, I might recommend checking out Devils Postpile another ancient wonder in Inyo National Forest. Here's a few pictures I took on our trip, you should be able to click on any of the pictures to get a better view.
These hexagon shaped basalt columns are over 60 feet tall. They were created about 80-100,000 years ago when lava uniformly cooled. Here's a much better explanation about this interesting formation: http://www.nps.gov/depo/naturescience/geology.htm
This last picture is up at the top of Devil's Post Pile where glaciers polished the tops of these columns many years ago. This top section looks like a bunch of hexagon tiles. Here's a young tree growing in between the cracks of the tiles.