[kimosabe31]

I think these guys are full of s#!t...whadda you think blam?

[Nateman]

Nuclear reactions create a large neutron flux. That causes quite a few changes in the surrounding material that would never have happened otherwise. Since radioactive decay is a very reliable natural clock it is also easy to figure out just when all of this happened. I read about this natural reactor many years ago and the neatest thing about it is that the radioactive by products never moved more than a fraction of an inch from where they were produced, showing that it was a very environmentally friendly reactor too.