Last bolt on Fearless Leader.

As more and more land gets eaten up in Phoenix area, the birds have less habitat. Consequently many areas that used to not have bird sh*t now have signs of the excrement. The last bolt on Fearless Leader is surrounded by a substance other than chalk. Perhaps these areas will be subject to seasonal closure in the future to preserve bird habitat (like Cochise Stronghold, The Summit Crags, and Granite Mountain).