Neat, that walk over the clear ice. But what's that white gash on the mountside: a large rock slide or something else?

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“What is the good of having a nice house without a decent planet to put it on?” - Thoreau

That's a landslide. There are many slides (about 60 worth climbing) in the Adirondacks.

Here's a pic taken while climbing that slide last December.
http://adkhighpeaks.com/neil/outdoor%20 ... 0022b.html

This pic shows nearly the whole slide and you can see the pond (thin blue line) directly above the hiker's head near the top of the photo.
http://adkhighpeaks.com/neil/outdoor%20 ... _0035.html