When I was in school, the forestry proffesor said that we should mark both the trunk AND the stump with paint so the harvestors didn't cut more than they were supposed to. Without painting the stump (or root flare) there's no way to verify unless you are on site and watch every log taken out.
Large trees are very nice, but they can be left to grow too long for useable wood too. Check with the State, they might have a forester come out at no charge. I have a friend who's a retired forester, and he did some recommendations for me when he was here visiting. Learned some new things, and got my memory jogged for things that I forgot.