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Porphyroclasts and kink bands (~20cm across) in sheared, mylonitic schist. Granitic porphyroclast near center originated as a sigma type porphyroclast (indicates top-left sense-of-shear) but was rotated by the kink band to appear like a delta-type to mistakenly indicate the opposite sense. (170401-19)Download Image
Panorama view of angular unconformity between the Cambrian Transgressive Sequence and tilted Proterozoic rock in the Grand Canyon, Arizona. The Tapeats Sandstone pinches out against the brown knob of Shinumo Quartzite on the right, which persisted as an island during the Cambrian Transgression. (IP18-6294)Download Image
View up Bright Angel Canyon of the Grand Canyon, AZ. The Great Unconformity appears at the top of the Inner Gorge beneath the Cambrian Tapeats Sandstone. Rocks in foreground belong to the Kaibab Limestone. The unconformity is a nonconformity on the right side of the photo, but an angular unconformity on the left. (180519-37)Download Image
View of the Great Unconformity in the Grand Canyon. Towards the bottom of the photo, it’s a nonconformity between the Cambrian Tapeats Sandstone and the Proterozoic metamorphic rocks (notice the granitic sill); In the middle of the photo, it’s an angular unconformity where the Tapeats sits on top tilted Hakatai Shale. (180519-27)Download Image
Grand Canyon, Arizona and Paleozoic section as seen from the South Rim. The Great Unconformity appears betneath the prominent ledge of Cambrian Tapeats Sandstone at the top of the Inner Gorge. The unconformity is a nonconformity on the right side of the photo, but an angular unconformity on the left. (180519-22)Download Image