This is a small crag, cast down below Pegasus, as it were in legend.
This crag may be encountered by one bushwhacking between The Apostle or Tiny Tower and Pegasus or the Sphinx if you wander too low. The very top of the crag lines up with the Southern edge of Pegasus if it were to continue a few hundred meters down, and it can be seen just peeking out of the trees in the attached photo. The round-topped twin crags to the right, more directly below Pegasus is the formation we call Medusa, of whose mythical bloodline the Pegasus was born. The line in and of itself is a reasonable romp, but not much more can be said of it other than if you are climbing every rock in the area, that here is one more.
This rock is approached as for Pegasus, staying left (South) to approach the Southern end of that crag. Perhaps a quarter mile short of Pegasus, below and left, this rock will present itself. It can be seen. The approach time is ~45 to 60 minutes from the North Shanahan Trailhead and is overland though forest and field. I will not try to describe it in great detail, as it is something you find, not follow.
The GPS I have put in may be your best guide. Check out the google map attached via link. It is recently verified on that map.