Spotted this in Cascade Canyon, in the Tetons of Wyoming, last weekend:
Nice asymmetric antiforms and synforms in the gneissic layering of the Archean basement rocks exposed there. Also, we saw a bull moose. More on that later on, when I get more time.
I do know active geologists who would still debate whether or not those a relict sedimentary features. It’s hard to tell from the photos (and from float), but did you see an axial-planar foliation present? Sometimes the way strain exhibits itself in rocks makes me wonder if I’m seeing something tectonic or something sedimentary that managed to survive quite a beating…