Posted: Nov 07, 2016 5:41 pm
The_Metatrix took a walk to the top of the formation at UTM 13T DF 7290 5815 while the boys and I were investigating that formation with the flow pattern. After we got down from that fairly steep hillside, we went to meet her.
Near the top, at UTM 13T DF 7295 5820, was a typical outcrop of the coarse grained Sherman granite, identical to what we sampled a couple weeks ago, and what is visible in pretty much any direction in that area:
Right next to that prominence though, was another formation of the same fine grained red granite I and the boys just investigated on the hillside to the north, on the other side of Middle Crow Creek. It shows the same fracturing as the coarse grained Sherman granite. But, being so fine grained, it weathers much better, and is much stronger.
Here, I've pried away a slab of that fine grained granite along a fracture line:
You can see the fresh, lighter colored areas where that slab broke away from its parent. The dark areas were where there was root wedging occuring. Tertius identified that process. Apparently, The_Metatrix has been going over some of these processes during their lessons, and Tertius was paying attention.
Near the top, at UTM 13T DF 7295 5820, was a typical outcrop of the coarse grained Sherman granite, identical to what we sampled a couple weeks ago, and what is visible in pretty much any direction in that area:
- Sherman granite
- IMG_1434.jpg (346.29 KiB) Viewed 3572 times
Right next to that prominence though, was another formation of the same fine grained red granite I and the boys just investigated on the hillside to the north, on the other side of Middle Crow Creek. It shows the same fracturing as the coarse grained Sherman granite. But, being so fine grained, it weathers much better, and is much stronger.
Here, I've pried away a slab of that fine grained granite along a fracture line:
- fine grain
- IMG_1437.jpg (213.83 KiB) Viewed 3572 times
You can see the fresh, lighter colored areas where that slab broke away from its parent. The dark areas were where there was root wedging occuring. Tertius identified that process. Apparently, The_Metatrix has been going over some of these processes during their lessons, and Tertius was paying attention.