File:Concretions in the Navajo Sandstone (Lower Jurassic; north of Bootlegger Canyon, Utah, USA) 1.jpg
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English: Concretions in sandstone in the Jurassic of Utah, USA
This outcrop 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 rounded structures are concretions - post-depositional structures found in some sedimentary successions, often in shales. They vary in mineralogy, size, and shape, but often have slightly flattened spheroidal shapes. They form by post-depositional mineralization around some nucleus (e.g., a rock fragment or fossil fragment). Stratigraphy: Navajo Sandstone, Glen Canyon Group, Lower Jurassic Locality: outcrop along Corona Arch Trail, north of Bootlegger Canyon & east of the Colorado River, west of the town of Moab, eastern Utah, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/52491683957/ |
| 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@N05/52491683957. It was reviewed on 13 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 04:21, 13 November 2022 | | 4,000 × 3,000 (7.86 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52491683957/ with UploadWizard |
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