IIRC, the YEC crowd has this novel notion that C14 dating is perfectly accurate right up to 6-10,000 years ago, and then suddenly becomes utterly bogus.
"IIRC, the YEC crowd has this novel notion that C14 dating is perfectly accurate right up to 6-10,000 years ago, and then suddenly becomes utterly bogus."
Actually, many YEC's believe that C14 dating is completely accurate, as long as you account for changes in the C14 ratio in the biosphere. For example, approximately 4,500 years ago, the flood drastically changed that ratio.
The C14 ratio in the environment is governed by (a) the amount of carbon in the biosphere, and (b) the amount of C14 generated in the atmosphre.
(b) remains relatively constant. However, the flood (as evidenced by the geologic column) drastically altered (a), removing a lot of carbon from the biosphere. Therefore, the C14 ratio pre-flood would have been much smaller than the C14 ratio post-flood. Therefore, measuring based on current C14 assumptions would yield older dates for things buried before and during the flood. When you adjust C14 dates to take this into account, many YECs maintain that the results are accurate to the biblical timeline.