See the definitive paper on the topic: “Paper, Rock, Scissors Ultimate Grudge Match: A Preemptive Strike By Pulpwood”.
Avalanches, not glaciers.
If the terrain isn’t steep enough for avalanches, maybe the UFOs bent the countryside sideways until the snow slid!
Two very skeptical theories:
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How many people have actually been to the location? I could create a convincing version of this in Photoshop.
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If I were a prankster, it’d be a lot easier to get something up there that *looks like *a boulder, than to hoist up the real thing. Waterproofed papier maché?
I don’t know anything about blasting; for those who do, does this sound plausible? It sounds like a terribly sloppy and dangerous blasting job if it results in 400-lb rocks flying 80 feet into the air.
I’m having a little trouble with the “prank” theory though: it doesn’t seem worth the trouble. It’s in a remote location, and hoisting a 400 lb rock 80 ft up is a fairly dangerous and difficult work. I have no doubt it’s possible, but would someone actually do it?