File:Thunderhead Sandstone (Neoproterozoic; Meigs Falls roadcut, Great Smoky Mountains, Tennessee, USA) 8 (36867927571).jpg
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Summary[edit]
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| Description |
Sandstone in the Precambrian of Tennessee, USA. This is a weathered outcrop of Thunderhead Sandstone, a unit in the ~50,000 feet thick Ocoee Supergroup. The Ocoee has considerable deposits of sandstone and shale originally deposited as sands and muds in an ancient ocean trench. Trenches form along subduction zones, where a tectonic plate composed of thin, heavy oceanic lithosphere dives down into the mantle below another tectonic plate of either oceanic lithosphere or thick, lightweight continental lithosphere. The Thunderhead Sandstone here consists of coarse-grained sandstone with granules. It has quartz and potassium feldspar - it's an arkosic sandstone. Subangular grains appear to dominate. Some phyllite interbeds are present - these were originally shales, but have been metamorphosed. The brownish coloration is iron oxide staining from weathering. Stratigraphy: Thunderhead Sandstone, Great Smoky Group, Ocoee Supergroup, Neoproterozoic Locality: roadcut on the northwestern side of Little River Road, near Meigs Falls, Great Smoky Mountains National Park, eastern Blount County, eastern Tennessee, USA (35° 40’ 12.07" North latitude, 83° 40’ 33.21” West longitude) |
| Date | |
| Source | Thunderhead Sandstone (Neoproterozoic; Meigs Falls roadcut, Great Smoky Mountains, Tennessee, USA) 8 |
| 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@N05/36867927571 (archive). It was reviewed on 6 December 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 | 02:14, 6 December 2019 | | 3,008 × 2,000 (6.3 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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