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Aging anything on Earth in the hundreds of thousands of years, or in the millions or beyond, involves little more than educated conjecture. A Guess never rises above the level of being a guess, no matter how scientific, no matter how educated, no matter how much consensus it enjoys, no matter how well it "fits" any popular hypothesis.
So, the now C14-incorporated carbon dioxide is breathed and absorbed into all carbon dioxide breathing plants, and then the plants are eaten by animals, and the C14 passes into animal tissues.
Even carnivores that eat only animal tissue absorb C14 from that animal tissue.
When the plant or animal dies no further isotope is absorbed and the beta radiation emission begins to gradually reduce to half strength, after the “half-life” of the isotope; 5,730 years in the case of C14.
Fortunately organic carbon is a constituent of all living material, and wood, bone, charcoal, peat, horn, and vegetable remains in soil can all be examined with sensitive Geiger counters, allowing for calculation of absolute age.
An earlier phase of this major conversion corrupted or adversely affected some fonts, alignments, quotes and tables in the previously published webpages.
Not to worry; this phase is converting them all, one by one.
(If you don't have a mouse, you can't "hover" it over a link without clicking just to see the simple acronym interpretation.) Note: Saturday, October 06, 2012 As part of the ongoing effort to upgrade this whole website, upgraded this webpage to the new BB 2.0 - SBI!
3.0 release and to make use of the new reusable code features.
When you hear a TV scientist on PBS, or on the History Channel, or on the Discovery Channel, or a teacher in a classroom, saying things like, today, we can accurately measure the age of earthly strata, you should know that what you are listening to is clear falsehood.