I think there are plenty of things like this, Tom, just that you're not thinking about it the right way which is, oddly enough, my point. There are a number of things in geology where previous theories get overturned not so much by discovering some new thing but by looking at something that people have looked at a lot but looking at it a different way and asking 'Well what if it's this other cause instead of what all of you have been arguing over?' For example, the big extinction (not the one caused by the meteorite impact) that took someone to come along and look at the data and say 'Well, have we looked at what the rocks tells us about CO2 levels? No? Hey, look at the huge CO2 jump caused by....let's see, that enormous outpouring of lava there in Siberia'.