This undisturbed old-growth woods is recognized by botanists as one of the most impressive stands of the original forest remaining in Indiana. This woods is classified as a western mesophytic forest type because it is intermediate between beech-maple and oak-hickory types. However, studies indicate that beech and maple are assuming greater importance. An unusual feature of the woods is the high percentage of white oaks. This region of the state is rich in karst features such as caves and sinkholes. Much of the run-off from the woods drains through sinkholes, rather than surface streams.