Seriously, defining "too many" is relatively easy. Have
you taken any advanced math? I'm sure you have. An equation
that has only one variable is relatively simple to extrapulate
the answer.

An equation with two variables is slightly harder,
and so on. Is an equation with four variables twice as hard
to determine as an equation with two variables? The difficulty
of any equation to solve goes up exponentially, not geometricly(sp?).

I submit the same is true for radioactive dating techniques.
The more variables to account for the more difficult to
determine the reliability of the results. It would be fairly
simple to account for a small number of variables (ie. only
two volcano eruptions occured during the span in question
would be relatively easy to account for).

But as the number of variables go up,
the more difficult, exponentially, it becomes
to determine the accuracy(Do we know, for any given
location how much volcanic activity occurred during the last
1 million years (assuming the earth was here then) there was?

And what severity? We may have a good guess, and the severity
would be known only in relative terms, not actual serverity.
How about the fact that there undoubtedly was a larger layer
of Ozone to protect us from the Sun's radiation (Unless the
caveman had flourocarbons (sp?)!). The accuracy of these
dating techniques would have to be questionable at best!