Ken Martin and Todd Hackett were kind enough to supply some photos to accompany the map. I have updated the map page with a couple of links to the photos. I also sketched in the upper line were the partial wall is located. To get to the photos hold your pointer over the two yellow markers at the top of the map. You may need to zoom in a bit to see the distinct markers. They tend to wander out of place when zoomed out and end up overlapping.
Thanks guys for the photos! I can hardly wait for a chance to explore this site.