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Proterozoic mudcracks, Montana
Mudcracks in Proterozoic Snowslip Fm. of Belt Supergroup, Glacier National Park, Montana. Photo about .75m across. (130723-53)
Download ImageProterozoic mudcracks, Montana (vertical)
Mudcracks in Proterozoic Snowslip Fm. of Belt Supergroup, Glacier National Park, Montana. Photo about .20cm across. (130723-52)
Download ImageProterozoic mudcracks, Montana
Mudcracks in Proterozoic Snowslip Fm. of Belt Supergroup, Glacier National Park, Montana. (130723-35)
Download ImagePurcell Sill, Montana (vertical)
Diorite sill (Purcell sill), intruding sedimentary rock of Proterozoic Belt Supergroup. Note the zone of bleaching along the sill caused by contact metamorphism. (130723-7)
Download ImageThrust fault, SW Montana
Thrust fault cutting dipping limestone of the Cretaceous Kootenai Formation, SW Montana. (130716-7)
Download ImageFolded limestone and thrust fault
Folded limestone and thrust fault, SW Montana (130716-5)
Download ImageFolds and thrust fault, Montana (Pan)
Folded limestone and thrust fault, SW Montana (130716-5)
Download ImageNonconformity. Northern Utah.
Nonconformity between basement rock (gray) and overlying Cambrian Tintic Quartzite (tan). Behind Ogden, Utah. (130712-41)
Download ImageNonconformity. Northern Utah.
Nonconformity between basement rock (gray) and overlying Cambrian Tintic Quartzite (tan). Behind Ogden, Utah. (130712-39)
Download ImageEocene palm frond and Herring (vertical)
Fossilized Eocene palm frond and herring. Green River Formation, Wyoming. Photo is about 1.5 m high. (180629-41)
Download ImageEocene Herring and palm frond
Fossilized Eocene herring and palm frond. Green River Formation, Wyoming. Fish is about 8cm long (180629-39)
Download ImageErosion of sea stack, Oregon (Vertical)
Fracture-controlled erosion of sandstone sea stack, Bandon, Oregon coast. (180616-97)
Download ImagePorphyroclasts 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)
Download ImageMeandering river and tidal inlet, Oregon
Aerial photo of meandering stream and tidal inlet between two sand spits, Sand Lake, Oregon. (100723-86)
Download ImagePalouse 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)
Download ImageGrand 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)
Download ImageAngular 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)
Download ImageGrand 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)
Download ImageGrand 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)
Download ImageGreat 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)
Download ImageGrand 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)
Download Image
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