This is confusing.
Wouldn’t the fecal matter of 65 climbers per year just decompose? Is it forever preserved because of the cold? What about wind, snow, ice, etc.? I find it hard to believe that it all remains intact year after year, but I’m not an expert.
The body of George Mallory, who died there in 1924 is said to be well preserved.
There Are Over 200 Bodies on Mount Everest, And They’re Used as Landmarks
http://www.smithsonianmag.com/smart-news/there-are-over-200-bodies-on-mount-everest-and-theyre-used-as-landmarks-146904416/?no-ist