In it, but not of it. TPM DC
I'm gonna go way out on a limb here and suggest that--just perhaps!--Barton has misread Chu's initial response to the question. And also that he doesn't seem to understand geology as well as the former Stanford physicist who now runs the Department of Energy. But I could be wrong.
Late update: My colleague Eric Kleefeld chimes in to suggest that Barton did stump Chu. In fact, Chu was stumped that this guy Barton (a Congressman) had actually asked that question.