Started at the northern terminus and ran southbound along the Four Birds trail, finishing at the Wildcat Ridge WMA parking area. The first 3.5 miles were recently reblazed, making navigation a breeze through this section. The only real navigational issue was at the northern section of Timberbrook Lake, about 6 miles into the run. Seems there are both old and new blazes, each following a slightly different path. One runs along the lake shore while the other passes through a thick pricker patch and stream crossing before reconnecting 100 yards up. Of course we opted for the more difficult path. This section could probably use a reblazing to avoid confusion.
As others have noted, this is an extremely rocky and technical trail which slows the pace substantially. The combination of route-finding and rock hopping make this route more challenging than it would appear. Some very remote sections and one of the hidden gems of North Jersey. For a full write-up, see our strava posts.