> Not all the dates can have been adjusted this way, because the
>first radiometric dates had nothing to be compared to. They were much
>older than expected. In a more modern example, moving the
>Precambrian-Cambrian boundary from 570 to 540 million [someone found
>datable deposits closer to the boundary than anyone had previously] was not
>what was expected by evolutionary evidence-that makes the changes within
>the Cambrian occur much more rapidly.
the issue of radiometric dating, but with a specific example of how the
tail sometimes wags the dog.