File:Pleistocene terrace alluvium gravel atop Lower Jurassic Navajo Sandstone (north of Bootlegger Canyon, Utah, USA) 8.jpg
![File:Pleistocene terrace alluvium gravel atop Lower Jurassic Navajo Sandstone (north of Bootlegger Canyon, Utah, USA) 8.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Pleistocene_terrace_alluvium_gravel_atop_Lower_Jurassic_Navajo_Sandstone_%28north_of_Bootlegger_Canyon%2C_Utah%2C_USA%29_8.jpg/800px-Pleistocene_terrace_alluvium_gravel_atop_Lower_Jurassic_Navajo_Sandstone_%28north_of_Bootlegger_Canyon%2C_Utah%2C_USA%29_8.jpg?20221114032041)
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Summary
[edit]DescriptionPleistocene terrace alluvium gravel atop Lower Jurassic Navajo Sandstone (north of Bootlegger Canyon, Utah, USA) 8.jpg |
English: The reddish brown bedrock consists of eolian sandstones of the Navajo Sandstone, a thick, Mesozoic-aged unit representing ancient sand dune deposits. The Navajo is a prominent cliff-forming unit in much of western America. The coloration is from hematite (Fe2O3 - iron oxide). Laterally-equivalent units are known by other names, but are all the same deposit: Glen Canyon Sandstone, Nugget Sandstone, and Aztec Sandstone.
The gravel atop the Navajo is Pleistocene-aged terrace alluvium (= unit "Qat" and "Qat6" on geologic maps of the area). This description is from Doelling et al. (1994): "Terrace alluvium -- Rounded, moderately sorted gravel (cobbles and pebbles) transported into the area by the Colorado River and deposited at several levels. Contains lenses of finer sand and silt, some of which contain flour gold and magnetite." This description is from Doelling et al. (2002): "Alluvial-terrace deposits (Pleistocene) - Moderately sorted, poorly stratified gravel in a calcareous sandy matrix; contain a variety of locally derived and exotic clasts . . . ; preserved as isolated remnants along major drainages; . . . Qat6 gravels are between 260 to 280 feet (70-85 meters) above the present stream channels; . . . ; as much as 60 feet (18 meters) thick. Bedrock stratigraphy: Navajo Sandstone, Glen Canyon Group, Lower Jurassic Locality: along Corona Arch Trail, north of Bootlegger Canyon & east of the Colorado River, west of the town of Moab, eastern Utah, USA References cited: Doelling, H.H., W.A. Yonkee & J.S. Hand. 1994. Geologic map of the Gold Bar Canyon Quadrangle, Grand County, Utah. Utah Geological Survey Map 155. Doelling, H.H., M.L. Ross & W.E. Mulvey. 2002. Geologic map of the Moab 7.5' Quadrangle, Grand County, Utah. Utah Geological Survey Map 181. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/52495869486/ |
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@N05/52495869486. It was reviewed on 15 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
15 November 2022
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current | 03:20, 14 November 2022 | ![]() | 4,288 × 2,848 (8.63 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52495869486/ with UploadWizard |
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File change date and time | 23:01, 11 November 2022 |
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Exif version | 2.21 |
Date and time of digitizing | 16:56, 11 May 2014 |
Meaning of each component |
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Date metadata was last modified | 18:01, 11 November 2022 |
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