Must have been ground into a road a long, long, long time ago. That road existed in the 1930's.
http://maps.njpinebarrens.com/#lat=39.759504796225244&lng=-74.66558575630188&z=16&type=nj1930&gpx=
Edit: Also, if this thread turns into the last one, I'm going to slag it and be handing out 48 hour...