[HalfFull]

the thing is, each one of his days are about 670,000,000 years long

Many people share your opinion, but it seems the amount of C14 can still be measured in fossils that are supposted to be many million of years old. Since C14 cannot be measured more than 20,000 years or so, what is your explanation?

[VadeRetro]

Many people share your opinion, but it seems the amount of C14 can still be measured in fossils that are supposted to be many million of years old. Since C14 cannot be measured more than 20,000 years or so, what is your explanation?

So you haven't absorbed a thing so far, right?

[StatesEnemy]

Many people share your opinion, but it seems the amount of C14 can still be measured in fossils that are supposted to be many million of years old. Since C14 cannot be measured more than 20,000 years or so, what is your explanation?

Ummm, we don't understand (as much as we think we do) the absorption of C14. Perhaps there is a mechanism which can 'contaminate' fossils.

[MontanaBeth]

"AMS" method improved the sensitivity of the raw measurement of 14C/12C ratio from approximately 1% of the radom value to about 0.0001%, extending the rang of sensitivity from about 40,000 years to 90,000"

This is in the article this new method extends the range to up to 90,000 years.