As mentioned, the Goat Rocks, like most of the Southern Cascades is a collection of choss piles .. that being said, its one of my local favorites.
The Goat Rocks traverse is actually fairly common and is usually accomplished from the North Folk of the Tieton River which provide easy access to the PCT via Tieton Pass and an eastward looping traverse ending with Bear Creek Mtn.
If interested ... check with the FS on access up NF-1207 ... I believe there may be some issues due to floods in recent years.