obvious flat faced boulder on the left side of the trail. Many variations on this, try the traverse from left to right, if you get that now go back to the left side. If you want to top out a problem go up top and scope it out. Check the condition of the rock at the top, there will probably be some loose stuff up there.
Continue past Wild Iowa wall on the main trail maybe two minutes. You will see the boulder on your left.
Isn't this rig called the "Razorback" boulder? I've taken hundreds of falls from it, back when I was a grommet learning what bouldering was and studying the finer arts of Z-clipping "Tasmanian Devil" or taking a ridiculously unnecessary whipper off Super Fly...