Ok, its a bit much, I know, but I spent some time working in the Geology Department at Ohio State writing 3D animation software, so I have a bit of a soft spot for this.
http://www.cnn.com/2002/TECH/science/12/03/canada.rocks.reut/index.html
D
http://www.cnn.com/2002/TECH/science/12/03/canada.rocks.reut/index.html
D