re: Rocks
I live down south of Argentina, and travel a lot from Neuquén to Bariloche and also I trek a lot. If you really want to know more about rocks at Patagonia, there´s too mucho to say, so I´ll fin out the e-mail of one of the persons that knows the most about this subject. Actually they´re a couple, she´s got a degree in chemical research and he is a geologist.
I have a friend of mine that teaches skiing at Colorado resources, Denver, Boulder, etc. so any thing you need just mail me.
Luis.