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Acknowledgments: The editor wishes to acknowledge many useful comments and contributed material from numerous friends and colleagues, including Glenn Branch, Brent Dalrymple, Peter Hess, Mark Isaak, Duane Jeffery, Kenneth Miller, Steven Peck, Eugenie Scott and others. Wiens has a Ph D in Physics, with a minor in Geology.
Radiometric dating techniques indicate that the Earth is thousands of times older than that--approximately four and a half billion years old.
Surface exposure age dating requires intensive chemistry.
Our samples are now pre-treated at the University of Canterbury.