He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes.
I note with great interest btw that in the short time since I pointed to the above example User: Rjwilmsi has already made a fix to the first date, a sign at how efficient our fixer-uppers are, and how even searcing out all such instances that exist today don't reflect the true level of confusion of the inputting editors, as fixer bots have already "fixed" unknown numbers of such errors.
Similarly, in my second example above, User Eubulides' solution where the date made no sense has been to delete the entire citation (and he has done us the service of putting the other dates into YYYY-MM-DD format).--Epeefleche (talk) , 3 October 2009 (UTC)Goodness me, what a lot of head-in-the-sand nonsense has been written here.
Chronological Analysis of the Scriptures- Literal interpretation of the scriptures led some people to conclude that the Earth was created approximately 6,000 years old.
In fact, Archbishop Usher of Ireland calculated that the Earth was created at 9 AM on It was believed that prior to the Great Flood, Earths surface was flat and its climate was mild.
Many Christians have been led to distrust radiometric dating and are completely unaware of the great number of laboratory measurements that have shown these methods to be consistent.
Many are also unaware that Bible-believing Christians are among those actively involved in radiometric dating.Mountains, erosion, and variations in climate were considered to be punishment for the sins committed by humanity.Buffon's Iron Sphere Experiments- On the basis of iron sphere cooling experiments, Frenchman Georges de Buffon estimated that the Earth would have needed 75,000 years to cool to its present temperature.The quantitative approach is admirable, but Buffon's assumptions are flawed. Silicate minerals have lower heat conductivity than steels and are better insulators leading to slower cooling rates.Second, the calculations did not incorporate the heating effects of radioactive decay.Strata Thickness- In the late 1800s, a British geologist estimated that 75 million years has lapsed since the beginning of the Cambrian.