Same goes for dendro thermometers, as used by Prof Mann et al. Your friend's email. Alan Zindler, a professor of geology at Columbia University who is a member of the Lamont-Doherty research group, said age estimates using the carbon dating and uranium-thorium dating differed only slightly for the period from 9, years ago to the present. Sincescientists have reckoned the ages of many old objects by measuring the amounts of radioactive carbon they contain. Mah Jong Quest.
Materials provided by Cornell University.
Carbon dating accuracy called into question after major flaw discovery
Cornell University. When these plants and animals die, they cease taking in carbon. I just listened to a series of lectures on archaeology put out by John Hopkins Univ. We believe all the dates over 5, years are really compressible into the next 2, years back to creation. But if you took a core in the eight oclock position, you would find broad rings and even wider rings, which may match to a completely different date.