[spoon]

Originally posted by Jack Simth:


1) Initial values of parent and daughter elements
These values haven't been observed in the distant past that the object comes from.

2) Non-migration of both the parent and daughter elements.
While specimin collectors try to get samples from the field where this assumption is reasonable, the testing facility virtually always throws out much of the data from every sample because the ages resulting from that data are essentially zero.

You will likely find a better argument over at talkorigins.org. I think your three points are addressed here:
isocron dating

In the future, after you make one of these Posts, you can do a search on talkorigins and cut-n-paste your findings in a reply to your own post. Not only will it save others the time from having to look it up themselves, but it will inflate your post count! Everyone wins!

-spoon