Name that scat

Last month I did my annual trip to the Northern Sierras.  Armed with a three weight and a jonesn' for some intense hiking, I spent a lot of time wandering the elevation.  At one point I had interesting poop sighting - one that didn't resemble any bear or hoofed animals I'm aware of - that said, I'm no scatologist.

Let this serve as a shout-out to the Chum Nation for a little help.  Details:

• elevation: 6500 feet
• nearest city: Quincy, CA
• known large animals in the area: human, black bear, cougar, deer
• scat size in these photos: diameter of a medium sized dinner plate
• There were 20 similar piles of this (pun intended) crap scattered across the area of a 1/2 acre

Thoughts?