File:Fault slickenlines (Morrison Formation, Upper Jurassic; Carnegie Quarry, Dinosaur National Monument, Utah, USA) 1 (48861588583).jpg
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| Description |
Faults are fractures or fracture systems in rocks along which there has been differential displacement. Fault movement is usually in the form of sudden jolts. Such events release energy in the form of shock waves, which are the cause of earthquakes. Faults form by extensional stress (stretching) or compressional stress (pushing together) or shear stress (ripping/tearing). Fault surfaces are often polished by the grinding action of the movement - such surfaces are referred to in geology by the horrible term "slickensides". Many fault surfaces have thin, straight scratches or deeper grooves, formed by gouging during fault movement. These linear scratches are called slickenlines. Seen here is a slickenlined fault surface developed in coarse-grained siliciclastics in the Jurassic of Utah. The dark-colored grains are black chert pebbles. Stratigraphy: Carnegie Quarry Sandstone, Brushy Basin Member, Morrison Formation, Kimmeridgian Stage, Upper Jurassic, ~150 to 156 Ma Locality: Carnegie Quarry, Dinosaur National Monument, northern Uintah County, northeastern Utah, USA |
| Date | Taken on 8 June 2012, 15:55 |
| Source | Fault slickenlines (Morrison Formation, Upper Jurassic; Carnegie Quarry, Dinosaur National Monument, Utah, USA) 1 |
| 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@N05/48861588583 (archive). It was reviewed on 8 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:58, 8 October 2019 | | 4,000 × 3,000 (7.91 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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