Do you see it? Check below for an annotation of the fold that has been tormenting me for several hours now:
- This is an extraordinary example of a flame structure. Problem: I've never seen any example of this phenomenon even approaching this length and quality of development.
- This a drag fold over a thrust fault, with the upper portion of the rock moving to the left. Problem: I see no other supporting evidence for this supposed fault- in fact, no clear faulting of any kind in the photo. (There are, however, some "maybe..." faults in here, just nothing that's clearly convincing.)
- This represents an overturn of the entire sequence. Problem: Lots. I'd expect to see much more pervasive deformation, fracturing, and faulting in such a situation, unless this rock had been subjected to much higher confining pressures and temperature than was the case. As noted above, I don't have enough supporting photos to even check if that's a viable guess, but it doesn't seem likely. Another fail: I can't spot any geopetal structures to give me any sense of "which way's up" anywhere in the photo, near the fold or elsewhere.
Photo run through Paint.Net's autolevel routine for contrast and clarity, and annotated there as well. May 7, 2013. FlashEarth location.