Cornelius,
He wasn't negative - but just put it into perspective - he explained that as a geo (which he is) you need to use all the tools available - & none are conclusive. They all add to the big picture.
This is what I took from his comments.
Whereas I was led to believe, reading previous HC posters, that this was a new "failproof technology" - Definately not the case - Simon says !!
Cheers, Snoball.