Thanks Nathan. If you can picture a rolling grass land about 3 or 4 football fields square with a ridge along it's eastern edge. This tree is about 1/3 down from the ridge, hidden from the field, just off a heavily used deer trail. The trail leads towards a hardwoods area to the South and possibly bedding/cover to the North. I'm thinking that this rub is getting approached as the deer leaves the cover (North) and heads towards food (South - hardwoods).
Going over it again in my head I also recall seeing an unusual amount of deer pellets along this trail. Both clumped together and several spots of seperate pellet's. I re-read an article about pellet's and it stated that the composition, seperate or a clump, refers to what they're feeding on not the sex.
So, based on that I'd say they're eating the grass and leaves in the field and also the mast to the South.
We shall see...
-Jeremy