As Snowolf touched on you need specific type of trees to form tree wells. In Aus we don't get tree wells at all. Mainly due to the reason we don't get the volume of snow as they do in the PNW BUT even if we did, tree wells wouldn't from with our alpine gum trees. They are the complete wrong shape and they don't spread out at the bottom and taper at the top.
Thanks mate and thanks for the link and pic Snowolf..I'll study up on this and ask the guides when I go to Priiskovy if they have issues with tree wells.
Not sure if I can post links but this is a site for free ride tours in a mountain near where I am living in Siberia. They have snowcats to take you to top of the mountain and is an amazing adventure although it's quite remote and a hell of a long way from the states...Приисковый: фрирайд и сноукэтскиинг в Сибири
If you type in priiskovy in google there's some good you tube clips as well