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Michael Interviewed...
John Valley
Professor
January 13, 2001
Professor John Valley and his very precious rock. You were thinking that the earth's oceans were a mere 3 billion years old (give or take). Well, Dr. John Valley and his colleagues have the rock that may prove all of us wrong. They've found a zircon in a rock that dates back 4.4 billion years. See why zircon is more precious than diamonds? Check out the whole story at www.geology.wisc.edu/zircon/zircon_home.html.
Listen in for a lesson in geochemistry and find out what the grad students will be
doing next (Hint: Contact metamorphosis).
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