. . . But the one you seek is not like the others.
As you approach GZ, it would not be surprising should the word "serpentine" pop into your head; actually, what you see before you (except for the one you have come for) is all sandstone. If you are interested in the geological makeup and history of the material, you might enjoy GC69V21-Stone River Earthcache.
For this cache, we are interested in the familiar cast resin stone with a recess in the bottom to hold the cache log. I have done some custom camouflage work to convince muggles that it belongs, even though there is enough contrast for geocachers to recognize it when they see it. The cache is nestled in a niche without any weight on it from the structure; if you try to touch something that doesn't move, let it be.
Do watch your step here; when the ground is wet, it can be slippery.
Most of the nearby parking is free after 4pm and on weekends.