Two of the Coolest, Quickest Mountain Time Lapse Videos [WATCH]
According to Erik Walton's VIMEO notes:
A short time lapse of stars to star trails over Lone Peak, Big Sky, Montana. Shot over 2 hours with a Canon 5D Mark II. 30 seconds, f/2.8, 5000 ISO at 35 second intervals.
Here's his video of Big Sky Resort:
Here's his video of Bridger Bowl: