"Having reread all your contributions on radiometric dating, I don't think you've specified what unverifiable assumptions there are that make it such a flawed methodology.
Could you give us some details? Or provide a link?"
I did, Pip, but I'll do so again.
First, let me say that I'm not claiming it has "a flawed methodology." I believe the dating methods are valid to a point. The problem becomes when 1/ there are no other independent sources to cross-reference like dendrochronology (tree-ring dating) archaeology and recorded history and 2/ when they use it only to confirm their presuppositions.
For example, they already believe based on the geologic column, that dinosaurs are 65 million years old. So dinosaur bones are not dated. The rock strata surrounding the fossil is dated and the fossil is assumed to be the same age. (A reasonable assumption but not necessarily true for other reasons.)
Sometimes they date a fossil several different ways and get several different dates. They then pick the one which matches the geologic column and don't publish the other dates. If they don't get the date they want at all, they chock it up to contamination and don't publish the data. This is common practice.
The three primary assumptions are these:
- that the decay rate from parent to daughter isotope has remained constant through time
- that the rock sample contained no daughter isotopes at the start
- that there has been no leakage across time
There is good evidence to suggest that all of these assumptions are invalid. This Wikipedia article explains what I've just said in more technical language. Wikipedia is not a creation-friendly site.:
en.wikipedia.org/wiki/K%E2%80%93Ar_dating#Assumptions
Also, see this video and skip to where he talks about the assumptions.:
What you must understand is that these assumptions are widely known and not controversial within the scientific community. Ask a scientist who uses these methods and he'll say, "Of course." He won't say I'm lying. But these assumptions are not widely publicized to students or the general public so we assume on blind faith that they know what they're doing. For me, the blinders are off. I am not anti-science one iota but I am cautious and skeptical about the claims of scientists. I think we all should be.
One more example: Mt St Helen's blew in the early 1980s. Around 2000, researchers used potassium/argon dating to date some of the newly-formed rocks. By their own dating methods, the rocks should have dated to be about 20 years old. The results came back millions of years old. Obviously something is wrong.