File:Death Valley & Cottonwood Mountains & alluvial fans (bajada) (Death Valley National Park, California, USA) (31871104718).jpg
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DescriptionDeath Valley & Cottonwood Mountains & alluvial fans (bajada) (Death Valley National Park, California, USA) (31871104718).jpg |
Seen in the bottom foreground is part of a large alluvial fan in Death Valley, California. Alluvial fans are cone-shaped piles of sediments deposited at the mouths of desert canyons. They consist principally of poorly-sorted, coarse-grained materials - gravel and sand. Deposition occurs during flash flood events. Normally-dry washes in mountainous canyons experience highly intermittent high-flow events. During such episodes, moving water has sufficient energy to transport large volumes of heavy cobbles and boulders out onto adjacent valley floors. This fan has a lithic gravel-dominated top surface. This alluvial fan is located along Death Valley's northeastern margin. Death Valley is a graben - a down-dropped block formed by extensional tectonics. The mountain range in the distance (Cottonwood Mountains) is a horst - an uplifted block formed by the same process. In terrains with horsts and grabens, major normal faults define the boundaries between mountain ranges and valleys. Death Valley is an especially low graben. Its valley floor reaches well below sea level (about 280 feet). Notice that, in the distance, several alluvial fans have coalesced together along the base of the Cottonwood Mountains. An extensive deposit of laterally-coalesced alluvial fans is known as a bajada. Locality: view (looking ~west) of Death Valley & the Cottonwood Mountains from the near-westernmost stretches of Titus Canyon Road, Death Valley National Park, southeastern California, USA |
Date | |
Source | Death Valley & Cottonwood Mountains & alluvial fans (bajada) (Death Valley National Park, California, USA) |
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@N05/31871104718 (archive). It was reviewed on 6 November 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 November 2018
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current | 04:09, 6 November 2018 | 1,799 × 1,199 (3.01 MB) | Lu Brito (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Width | 1,799 px |
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Height | 1,199 px |
Bits per component |
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Compression scheme | Uncompressed |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 21:53, 5 November 2018 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | uuid:833E173D8A1411DBB5D58A5F2B0BA0F7 |
Date and time of digitizing | 14:12, 10 December 2006 |
Date metadata was last modified | 16:53, 5 November 2018 |
Copyright status | Copyright status not set |
IIM version | 32,767 |