newseed wrote:Example to show that the zero reset assumption is not always valid: volcanic ejecta of Mount Rangitoto (Auckland, New Zealand) was found to have a potassium-40 age of 485,000 years, yet trees buried within the volcanic material were dated with the carbon-14 method to be less than 300 years old. (. McDougall, A.A. Polach and J.J. Stipp, "Excess Radiogenic Argon in Young Subaerial Basalts From Auckland Volcanic Field, New Zealand," Geochemica et Cosmochemica Acta 33:1485-1520, 1969.)
You can put your trust in a "assumption" but I will not.
HUH?! I am missing something in your example.Stuff from the volcano is 485,000 years old and the trees taht were buried were <300 years old?...shouldn't they be? I don't understand the point here.