While out climbing around in the hills the other day, with MOH on one of our hikes, I came upon a fault zone in quartzite, along with a lot of steep and precarious ledges. There I am, above, standing on one ledge, looking down to another ledge in the shadows below the pine tree on the left, and looking even farther down to the ground below. Why am I doing that?
I'm doing that because from the ledge below the pine tree, and all the way to the ground, the entire mini-cliff of quartzite is slickensided. In the photo above, I've reached the lower ledge, and am trying to get a foothold so I can take a photo (surprise!). You can see some of the slickensides just above that field boot of mine.
Ah! Here I've finally reached the point I want, and am standing on the ledge, looking down at a golden brown, iron-stained, slickensided surface, with my boots pointing more or less parallel to the slickenlines (straight down). It's a funny perspective, and MOH tells me that when I climbed down the ledge to the ground, that the slickensided mini-cliff was over my head, which means it was at least 5 feet high, maybe higher.