Found a, for the lack of a better term, clump of trees at my SIL's today. Looked like the multi trunk maple I see, but the leaves (the few that remain) tell me.....oak. Anybody ever seen oak "clumps" like this? Next ? perhaps for the foresters among us or just those in the know. Found a few oak trees right inside the state land side with these arrows. Must have been done after leaf drop this year. Anyone know what this signifies?