Just to wrap up some ideas, here is an image of what I see as the planar fabric in the shadowy area beneath the clasts in the photograph that we have been discussing. I have highlighted a few of the features, leaving some to be be seen in the enhanced state that Jon has produced.
There are lots of ramifications here. For one, when you see this material outside of the shadows (in an unenhanced photo), it is a very dark reddish brown. This all compares with the older observations by Sharp (from McKee) discussing a dark, weathered zone at the top of the Vishnu Schist.
I'm pretty sure that the description matches the material in the lower right of this image. the highlighted folia are more likely a soil or clayey zone at the very top of the Vishnu, possibly transported.
Note that the zone is not continuous and does not always occur beneath the quartz-rich pegmatite clasts.
The Vishnu is heavily weathered here. I wanted to try and get the schistosity orientation, but it is just a little to vague for me to feel confident; however in the larger scale picture you could see that the foliations are closer to vertical.
I think you can also see that the larger clast deforms the foliation beneath it. This suggests to me that the clast came to rest in a patch of mud, prior to deposition of the Tapeats.
As a final comment, I refer Faith to an image in
Message 272 in which there are boulders of granite and pegmatite suspended in the Tapeats. This is the image that I was thinking about when I called the clasts 'boulders' in an earlier post. It also indicates that there was erosion of the igneous/metamorphic rocks during deposition of the Tapeats.
Edited by Admin, : Change reference to message 272 to a link.