[MontanaBeth]

"The contamination Vade is talking about is rain."


I guess that means carbon dating is useless then, or was there no rain contamination before now?

[VadeRetro]

Back to about 50K, the decay curve sticks up out of the noise floor. I'm surprised the two geologists you claim to have worked for didn't mention how carbon dating works and how little relation it bears to the age of the earth.

[narby]

I guess that means carbon dating is useless then, or was there no rain contamination before now?

Rain caused carbon to be deposited in rock layers. It is not so much that you can't use carbon dating for relativly recent samples, but it does create a base noise floor (a minimum 14C amount) in all samples.

One of the previous posts from HalfFull quoted the article saying ther should be a zero amount of 14C in very old samples. But this is false.