Radiometric dating works. The "issues" that creationists have with it are most often taken out of context. This is true with both the 14 C dating and the K/Ar dating mentioned in the glurge from Chick. The K/Ar dating was used to date xenolyths which are foreign rock species and therefore are NOT a measure of the flow's age but rather closer to the consitutent rock's age.

Mollusks use carbon from a variety of sources to build their shells. It is to be expected that some of these sources would be old. Dating a mollusk shell with C 14 is an inappropriate method.

Of course, all of this can be found at http://www.talkorigins.org