Wild guess but looking at the two trees top of page left (page left).. if you started between the two trees and stepped off 100 paces and marked that spot, then continued another 100 paces and marked that spot... all along a straight line from between the to trees to what appears to be maybe a rock with a hole or a cave. Now, go back to the first mark made at the 100 pace mark and step off 100 paces to the "west" or toward right side of map. Do the same at the second mark made which would be 200 paces down from the tree, turn west again and step off a 100 paces. Now, make the two westerly 100 foot paces meet to form the point of a triangle... voila.. you have the small rectangle on the map where the two westerly 100 pace lines meet. Fool proof way to mark an exact spot, it appears to me. Now, just figuring out where the maps location is.. V. W. and what may be "Old Black?? Crossing" might be a good clue. dunno.