http://myu.icyworlds.net:4901/data/screenshots/1466/3ebb326e.jpg in this area. The snow doesn't hold, and you fall straight through.
RDIT: got the pictures you asked for.
http://myu.icyworlds.net:4901/data/screenshots/1466/57d18b3d.jpg
http://myu.icyworlds.net:4901/data/screenshots/1466/662966f6.jpg