"Earth age" estimates are based on Uranium decay, not C-14.
"Earth age" estimates are based on Uranium decay, not C-14.
In the old-earth model, yes. But my point was that C-14 is now well known to exist alongside C-12 even deep in the fossil record. Coal deposits and diamonds (which are composed of carbon) have been consistently 'dated' with C-14 dating techniques.
C-14 has a half-life of only ~5.7 KYA. At this rate after 10 half-lives (c. 57,000 years) less than 1/1000 of the original portion of C-14 would remain. After a million years a mass of C-14 the size of the earth would have completely decayed, not even a single atom of C-14 remaining. So the presence of C-14 in coal and diamonds conventionally thought to be hundreds of millions of years old is strong evidence they are not that old at all.