"In unit 2F there are few steep hillsides that are totally covered with rocks, where nothing will grow, while in unit 2G there are many steep hillsides where nothing can grow, short of a few trees that grow up between the rocks. Nothing more can grow on those hillsides because nothing can grow on the huge piles of rocks short of a little moss."

What areas of 2G are you talking about RSB? I know of a few on the north side of the West Branch between Lock Haven and Renovo, But the majority of the mountainsides that I know of have tree growth.