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Nonconformity. Northern Utah.

Nonconformity between basement rock (gray) and overlying Cambrian Tintic Quartzite (tan). Behind Ogden, Utah. (130712-41)

Nonconformity. Northern Utah.

Nonconformity between basement rock (gray) and overlying Cambrian Tintic Quartzite (tan). Behind Ogden, Utah. (130712-39)

Eocene palm frond and Herring (vertical)

Fossilized Eocene palm frond and herring. Green River Formation, Wyoming. Photo is about 1.5 m high. (180629-41)

Eocene Herring and palm frond

Fossilized Eocene herring and palm frond. Green River Formation, Wyoming. Fish is about 8cm long (180629-39)

Erosion of sea stack, Oregon (Vertical)

Fracture-controlled erosion of sandstone sea stack, Bandon, Oregon coast. (180616-97)

Porphyroclasts and kink bands ~20cm across

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)

Meandering river and tidal inlet, Oregon

Aerial photo of meandering stream and tidal inlet between two sand spits, Sand Lake, Oregon. (100723-86)

Palouse Falls, Washington

Palouse Falls in eastern Washington drops more than 180 feet over lava flows of the Grande Ronde and Wanapum members of the Columbia River Basalt Group. (161012-99)

Grand Canyon, Arizona (Pan)

Panorama view north over the Grand Canyon; Inner Gorge occupies the middle of the photo. The Great Unconformity appears at the top of the Inner Gorge beneath the Cambrian Tapeats Sandstone. Rocks in foreground belong to the Kaibab Limestone. (IP18-6309)

Angular Unconformity, Grand Canyon (Pan)

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)

Grand Canyon, Arizona (vertical)

View up Bright Angel Canyon of the Grand Canyon, AZ. The Great Unconformity appears as a nonconformity at the top of the Inner Gorge beneath the Cambrian Tapeats Sandstone. Rocks in foreground belong to the Kaibab Limestone. (180519-39)

Grand Canyon, Arizona

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)

Great unconformity, Grand Canyon, AZ

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)

Grand Canyon, Arizona

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)

Grand Canyon, Arizona (vertical)

View into Inner Gorge of Grand Canyon. Colorado River just visible at the bottom. Kaibab Limestone on the left. (180519-6)

Grand Canyon, Arizona

View north over the Grand Canyon; Inner Gorge occupies the middle of the photo. The Great Unconformity appears at the top of the Inner Gorge beneath the Cambrian Tapeats Sandstone. Rocks in foreground belong to the Kaibab Limestone. (180519-5)

Angular Unconformity, Grand Canyon (Pan)

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 that persisted as an island during the Cambrian Transgression. (180518-107)

Angular Unconformity, Grand Canyon

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 that persisted as an island during the Cambrian Transgression. (180518-107) sedimentary, Grand Canyon National Park, stair-step topography, erosion

Paleozoic sedimentary rock, Grand Canyon, Arizona –view of the Cambrian Muav Limestone up to the Permian Kaibab Formation. (180518-104)

Mississippian Redwall LImestone, Grand Canyon, AZ

Mississippian Redwall LImestone and overlying (red-colored) Supai Formation, Grand Canyon, Arizona (180518-103)

Overturned cross-bedding in sandstone.

Overturned cross-bedding in sandstone (180518-91)