This Scat's For You

[NKP68]

I thought I'd interject some whimsy here with this image. I captured this on a trip to a local PA (Philly area) State Park. The animal, whatever it was, deposited this neat pile in the middle, and on top of, a flat rock. I don't think it was a domestic dog because of the color and contents of this dropping. The big red eyed fly was the reason I decided to take the shot. Does anyone know what kind of animal may have left this sample?
C&C please.