File:Angular unconformity - Flagstaff Formation over Twist Gulch Formation (Salina Canyon, central Utah, USA) 2 (8292123578).jpg
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Summary
DescriptionAngular unconformity - Flagstaff Formation over Twist Gulch Formation (Salina Canyon, central Utah, USA) 2 (8292123578).jpg |
Angular unconformity in Utah, USA. One of the world's most impressive angular unconformities is located along Interstate 70 in Salina Canyon, Sevier County, central Utah, USA. Angular unconformities are formed by structural tilting of flat-lying sedimentary rocks, followed by erosion, followed by deposition of more flat-lying sedimentary rocks. The Salina Canyon angular unconformity can't get more angular than it is already. You've got flat-lying beds atop vertical beds, separated by an erosion surface having small-scale irregular topography. This angular unconformity is exposed throughout the lower parts of Salina Canyon (Salina Creek valley), east of the town of Salina, on both sides of Interstate 70 (but better seen on the northern side of the highway). Eastward of the photo shown above (i.e., to the right of the viewer), the underlying rocks become less vertical, and eventually have a disconformable relationship with the overlying rocks. The structural tilting of the Twist Gulch in Salina Canyon has been attributed to local salt dome tectonics. Evaporites occur in the underlying Arapien Formation (Middle Jurassic). Some of the Arapien's rock salt intervals have domed upward as salt diapirs, resulting in tilting of overlying beds. The Salina Canyon angular unconformity provides information about the timing of Arapien rock salt diapirism (post-Jurassic & pre-Paleocene - in other words, during the Cretaceous). The reddish-colored, vertically-oriented beds below the contact shown above are part of the Twist Gulch Formation (Middle Jurassic) - mainly siltstones, sandstones, and mudshales. The grayish-colored horizontal beds above the contact are sandstones of the basal Flagstaff Formation (mid-Paleocene). Halite salt casts, a rare sedimentary structure, occur on some of the bedding planes in the Twist Gulch Fm. at this locality. |
Date | |
Source | Angular unconformity - Flagstaff Formation over Twist Gulch Formation (Salina Canyon, central Utah, USA) 2 |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/8292123578 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 December 2019
Items portrayed in this file
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6 September 2007
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 03:51, 6 December 2019 | 2,048 × 1,536 (2.65 MB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot S2 IS |
Exposure time | 1/1,000 sec (0.001) |
F-number | f/3.5 |
Date and time of data generation | 15:58, 6 September 2007 |
Lens focal length | 6 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 15:58, 6 September 2007 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 15:58, 6 September 2007 |
Meaning of each component |
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APEX aperture | 3.614709851552 |
Exposure bias | 0 |
Maximum land aperture | 2.8659188034188 APEX (f/2.7) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 9,102.2222222222 |
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Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |