(June 14, 2012 at 2:57 pm)Undeceived Wrote: You're asking for a date that doesn't exist. According to creationism, the earth is no more than 6,000 years old. If you carbon-dated the oldest fossils, that's how old they would come out to be (Google carbon-dated dinosaurs. Not only do their fossils contain carbon which should all have decayed long ago, but the dates correspond uncannily to the Christian Bible). All cambrian dates are done with K-Ar or similar methods done on the rocks around the fossil. The methods require an assumption that the earth is old. If the earth is young, K-Ar is not accurate. We see this in the rocks of recent volcanic eruptions. We know the rocks are young, but they date to millions or billions of years (it's all over the place). They are simply too contaminated with the daughter isotope.
You really have no clue what you are saying, do you?
Do the creationsit sites that you get this crap from ever mention what a xenolith is? K/Ar is accurate and not all over the place as you suggest.
Contaminated with the daughter isotope? This statement alone proves your ignorance of radiometric dating. It's the daughter isotopes that scientists are interested in (well, more precisely the ratio of the daughter isotope to the parent isotope). You absurdly talk about 'contamination' with the daughter isotopes when in fact this is exactly what's being counted.
Another indication that you have no clue is again related to your use of the work contamination. You know there is a creationist argument in here somewhere and its related to the daughter isotope, but you are only blathering what you've hear or read and don't understand the science. The daughter isotopes of potassium and argon are gaseous, which means the issue isn't their contamination of the sample (already addressed), but that they can escape the rock when it is subjected to heat cycles. This is why this particular radiometric technique is only used on igneous rocks.
At least try to understand what the AIG or other creationists are saying before rolling into an forum like this with such obviously ignorant assertions.
