Another W3 pit tracksite is a few hundred meters away from the W3 Main site on the Two Camp Anticline. The W3 Extension site was only discovered in 1999 while prospecting for new sites. The lower part of the footwall is covered by sediment layers that do not have footprints upon them. The footprint layers are exposed about half way up the footwall. It is a dangerous place, with ample evidence of significant footwall failures nearby.
The ichnofauna of the W3 Extension sites is similar to that of the W3 Main site and likely involves many of the same track beds.