UNCONFORMITIES
just a sampling… go to Keyword Search for more!
Buttress Unconformity, northern Arizona
In buttress unconformities, the younger material
is deposited against the older material, resulting in the apparent truncation of the younger rock. On closer inspection, however, one can see erosional features along the contact to indicate its depositional
origin. (ID SrU-25)
Angular unconformity, WA
Marine gravels overlie faulted terrestrial sediments at Pt. Defiance State Park, Washington (Image ID# SrU-21)
Download ImageAngular Unconformity, Grand Canyon
Angular Unconformity, Grand Canyon National Park, Arizona (SrU-07)
Download ImageGreat unconformity, Grand Canyon, Arizona
Great unconformity –a nonconformity in this photo. Sequence of Cambrian sandstone (the ledge across the middle of the photo), shale (the overlying slopes) and limestone (the upper cliffs) deposited on top the Vishnu Schist in the Grand Canyon, Arizona. (Image ID# SrU-02)
Download ImageAngular Unconformity at Siccar Point, Scotland
Steeply dipping lower Silurian rock overlain by gently dipping Upper Devonian Old Red Sandstone, described by James Hutton in 1788. (Image ID# SrU-01)
Download ImageGreat unconformity, Grand Canyon (vertical)
Aerial view of nonconformity: Precambrian-Cambrian Unconformity, Grand Canyon National Park, Arizona (SrU-03)
Download ImageNonconformity, Utah
Precambrian-Cambrian Nonconformity, exposed in a tilted sequence, Wasatch Mtns., Utah. (ID#SrU-15)
Download ImageNonconformity, Teton Range, Wyoming
Precambrian-Cambrian Nonconformity, Grand Teton National Park, Wyoming. (ID #SrU-10)
Download ImageNonconformity, Teton Range, Wyoming
Precambrian-Cambrian Nonconformity, Grand Teton National Park, Wyoming. (#SrU-09)
Download ImageNonconformity. SW Montana
Cambrian Flathead Sandstone overlies Precambrian basement schist, Montana (170804-3)
Download ImageNonconformity, Colorado
Nonconformity (a type of unconformity) between Cambrian sandstone and underlying Precambrian metamorphic rock, Glenwood Canyon, Colorado. This unconformity is frequently referred to as the “Great Unconformity”. 5D-5008)
Download ImageTilted nonconformity, Montana
Cambrian Flathead Sandstone overlying Proterozoic gneiss in Southwest Montana. Note the pegmatite dike in the gneiss and the basal conglomerate in the sandstone. A nonconformity is a type of unconformity in which sedimentary rock depositionally overlies intrusive igneous or metamorphic rock. (Image ID# 100629-37)
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 ImageGreat Unconformity, Colorado.
Great Unconformity, a nonconformity between Cambrian Sandstone and Precambrian basement rock along the Eagle River, Colorado. Note old mine workings. (5D-5049)
Download ImageFaulted angular unconformity (pan)
Faulted angular unconformity between Pliocene basalt and folded, faulted, and intruded Paleozoic rock, SE California. Granitic rock forms the left side of the exposure (ID#SrU-19)
Download ImageDisconformity, Nevada
Disconformity, a type of unconformity between parallel sedimentary rock units. Cretaceous conglomerate of the Willow Tank Formation above Jurassic Aztec Sandstone, Valley of Fire State Park, Nevada. (221123-56)
Download ImageNonconformity: Ash flow tuff on metamorphics
Nonconformity: 22Ka Ash flow tuff on Eocene metamorphic rock of the basement of Santorini, Greece. (180325-138)
Download ImageAngular unconformity, Kyrgyzstan
Angular unconformity, Tien Shan Mtns., Kyrgyzstan. (ID# SrU-18)
Download ImageAngular unconformity, Kyrgyzstan.
Angular unconformity, Tien Shan Mtns., Kyrgyzstan. (#SrU-17)
Download ImageAngular unconformity, Olympic Coast, Washington
Angular unconformity between dipping Miocene Hoh Assemblage and flat-lying beach gravels, Olympic Coast, Olympic National Park, Washington. (150913-32)
Download ImageAngular unconformity, Kyrgyzsta
Angular unconformity (note syncline below), Tien Shan Mtns., Kyrgyzstan (SrU-16)
Download ImageAngular 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)
Download ImageAngular Unconformity, Grand Canyon
Angular unconformity between the Cambrian Tapeats Sandstone and Bright Angel Shale and tilted Proterozoic rock in the Grand Canyon, Arizona. The Tapeats pinches out against the brown knob of Shinumo Quartzite that persisted as an island during the Cambrian Transgression. (180518-27)
Download ImageAngular unconformity, central Utah.
Angular unconformity and channel deposit, central Utah. Henry Mtns in background. (090322-37)
Download Image