"You can park a Volkswagen in your front yard, and within 2 years it will collapse into dust. I could never understand why people would think a wooden object would last thousands of years-- but... interesting nonetheless"
there's 2 factors that make it plausible. 1 being that there's less oxygen at that altitude, and 2 the cold, both would help keep the decaying bacteria at bay.
There's one factor that makes it impossible: the glacier. See my previous post.