File:Angular unconformity - Flagstaff Formation over Twist Gulch Formation (Salina Canyon, central Utah, USA) 16.jpg
![File:Angular unconformity - Flagstaff Formation over Twist Gulch Formation (Salina Canyon, central Utah, USA) 16.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/31/Angular_unconformity_-_Flagstaff_Formation_over_Twist_Gulch_Formation_%28Salina_Canyon%2C_central_Utah%2C_USA%29_16.jpg/800px-Angular_unconformity_-_Flagstaff_Formation_over_Twist_Gulch_Formation_%28Salina_Canyon%2C_central_Utah%2C_USA%29_16.jpg?20230225051159)
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Summary
editDescriptionAngular unconformity - Flagstaff Formation over Twist Gulch Formation (Salina Canyon, central Utah, USA) 16.jpg |
English: One of the world's most impressive angular unconformities is located along Interstate 70 in Salina Canyon, central Utah. Angular unconformities are formed by structural tilting or folding 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, with flat-lying beds atop vertical beds, separated by an erosion surface having small-scale irregular topography. The overlying beds are basal Flagstaff Formation (mid-Paleocene). The underlying reddish-colored beds are tilted Twist Gulch Formation (Middle Jurassic) (also known as the Twist Gulch Member of the Arapien Formation).
The 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, the underlying rocks become less vertical, and eventually have a disconformable relationship with the overlying rocks. The structural tilting of the Twist Gulch Formation has been attributed to local salt dome tectonics. Evaporites occur in underlying Middle Jurassic strata. Some of the 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 rock salt diapirism (i.e., post-Jurassic & pre-Paleocene - in other words, during the Cretaceous). The rocks just above the unconformity are sandstones, with some conglomerate lenses (basal lags). |
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Source | https://www.flickr.com/photos/47445767@N05/49919568788/ |
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@N05/49919568788. It was reviewed on 25 February 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
25 February 2023
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current | 05:11, 25 February 2023 | ![]() | 3,008 × 2,000 (5.33 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49919568788/ with UploadWizard |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/640 sec (0.0015625) |
F-number | f/13 |
ISO speed rating | 1,600 |
Date and time of data generation | 13:50, 7 September 2007 |
Lens focal length | 18 mm |
Width | 3,008 px |
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Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 12:13, 21 May 2020 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 13:50, 7 September 2007 |
Meaning of each component |
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Image compression mode | 4 |
APEX shutter speed | 9.321928 |
APEX aperture | 7.400879 |
APEX exposure bias | 0 |
Maximum land aperture | 3.6 APEX (f/3.48) |
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Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 27 mm |
Scene capture type | Landscape |
Scene control | Low gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Hard |
Subject distance range | Unknown |
Serial number of camera | 1004a0cc |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Date metadata was last modified | 08:13, 21 May 2020 |
Unique ID of original document | 3213A8A9A22719479021704F2DA2A5FB |