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In a related article on geologic ages (Ages), we presented a chart with the various geologic eras and their ages.

In a separate article (Radiometric dating), we sketched in some technical detail how these dates are calculated using radiometric dating techniques.

Radioactive decay rates have been measured for over sixty years now for many of the decay clocks without any observed changes.

And it has been close to a hundred years since the uranium-238 decay rate was first determined.

Whenever possible we design an age study to take advantage of other ways of checking the reliability of the age measurements.

Dating schemes based on rates of radioactivity have been refined and scrutinized for several decades.Several hundred laboratories around the world are active in radiometric dating.Their results consistently agree with an old Earth.Here is one example of an isochron, based on measurements of basaltic meteorites (in this case the resulting date is 4.4 billion years) [Basaltic1981, pg. Skeptics of old-earth geology make great hay of these examples.For example, creationist writer Henry Morris [Morris2000, pg.

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