With the exception of Joe Meert's off-topic side comment, I note the total absence of participation by those of this forum that I view as the best at forwarding geological arguements.
Personally, my geology is just strong enough, to find the geology arguements being put forward to be of dubious quality. I sure would like to hear from a real expert on the Andies Mountains.
In general, a mess of a topic.
I may be wrong,
Adminnemooseus