identify this scat`

[Brian D Toohey]

Quite often while backpacking in the New England area, I come across
scat 3-5" long. Hair fibers are usually visible, and the dropping is
usually pointed at one or both ends. The unusual thing about this
particular type of scat is that it always seems to be deposited atop a
medium-sized rock (up to 1.5 ft. in diameter), frequently in the middle
of a hiking trail.

What animal produces this scat? It may seem odd, but I've wondered
about this for a while.

Email would be great.

Thanks,
-Brian