Potassium argon dating accuracy
If two or more radiometric clocks based on different elements and running at different rates give the same age, that's powerful evidence that the ages are probably correct.
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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.
These articles are updated periodically as new research results and scholarship become available.
Detailed references are given in all cases, with web links where available, and all references are listed in an extensive bibliography.Such failures may be due to laboratory errors (mistakes happen), unrecognized geologic factors (nature sometimes fools us), or misapplication of the techniques (no one is perfect).