Found this on a fairly remote trail through a small river canyon in the Gifford Pinchot. In the half dozen or so times I've hike this area I've never seen scat from anything larger than a rodent and never seen anything larger than fishers and martins even though this area can have much larger mammals.
This was gray in a way I've never seen from bears or coyotes. I'm guessing cougar, but maybe a fat raccoon? No noticable berries, seeds, fur, or bones. Very little human presence for 10+ miles in any direction from this find. Berries have died off though mushrooms are at their peak and still trout in the river.
Main piece was around 4 inches long (probably 6" total) and a bit over 1" in diameter. No tracks or other scat found. Note that the bit beneath the longest piece in the first picture is stone. One long and two small pieces. All pretty uniform.