This doesn't look like the Old Rag granite but more like the green stone (old lava flow) found along Skyline Dr. such as at Little Stony Man cliffs. Where was the photo taken?
As I recall, you park at the main parking lot for Old Rag. Then you take one of the trails towards Skyline Drive, and there's a cliif right along that trail on your left. I can pull a map if you want specifics, but I'm leaving this morning for the Adirondacks and Maine, and just don't have the time right now. I'll be gone for (2) weeks. Let me know. Later.