I found this article through the reddit/r/everythingscience discussion thread on tonight's debate, and thought I might find some interested fellows here.
At some point in the debate, Ham dragged up some anecdotal evidence about a 45,000 year-old piece of wood (maybe 450,000?) encased in what I think I remember as 4.5 billion year-old basalt. Nye sort of handwaved this away, saying perhaps the basalt "slid over" the younger material and never addressed it again, even after Ham brought it back up.
I'm pretty up on my creationism (sorry, ID) vs. evolution debate topics as I am an elementary school teacher and a former christian, but as this topic was novel to me I thought it deserved a bit of research. It seems to be similar to that classic creationist bit about polystrate trees.
Anyway, the article pretty much goes on to say that the person who made the original claim on the fossil essentially tucked it away in a drawer somewhere and won't let anyone else look at it, hence why I designated it anecdotal above.