[Creationist]

The Carbon-14 age estimating method is, at best, only useful for estimating the age of things that are thousands of years old, not millions or billions. And it does not work on rocks or thoroughly mineralized fossils; it is only useful for relatively well-preserved organic materials such as cloth, wood, and other non-fossilized materials. Other methods must be used to estimate the age of rocks and minerals. Two of the most widely-known systems are the potassium-argon method and the uranium-lead method.

http://www.tccsa.tc/articles/isochrons2.html

[Coyoteman]

The Carbon-14 age estimating method is, at best, only useful for estimating the age of things that are thousands of years old, not millions or billions. And it does not work on rocks or thoroughly mineralized fossils; it is only useful for relatively well-preserved organic materials such as cloth, wood, and other non-fossilized materials. Other methods must be used to estimate the age of rocks and minerals. Two of the most widely-known systems are the potassium-argon method and the uranium-lead method.

Well, of course! About time you cut and paste a reliable comment!

We have been trying to tell you for weeks that the radiocarbon method goes back only some 50,000 years.

it is only useful for relatively well-preserved organic materials such as cloth, wood, and other non-fossilized materials

Charcoal is the preferred material for radiocarbon dating, but bone, shell, and other once-living materials can also provide usable dates.

Here is another good site for information on radiocarbon dating.