File:Road Prong of the Little Pigeon River with blocks of Thunderhead Sandstone (Chimney Tops Trail, Great Smoky Mountains, Tennessee, USA) (37047435501).jpg
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Summary[edit]
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| Description |
This mountain stream in Great Smoky Mountains is choked with abundant, large, subangular boulders of Precambrian Thunderhead Sandstone. It's one of many stratigraphic units 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 in the park 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. Stratigraphy: Thunderhead Sandstone, Great Smoky Group, Ocoee Supergroup, Neoproterozoic Locality: near trailhead for Chimney Tops Trail, next to Newfound Gap Road (Rt. 441) at mile marker 7.0 of Moore (1988) (A Roadside Guide to the Geology of the Great Smoky Mountains National Park, page 92), Great Smoky Mountains National Park, southern Sevier County, eastern Tennessee, USA |
| Date | |
| Source | Road Prong of the Little Pigeon River with blocks of Thunderhead Sandstone (Chimney Tops Trail, Great Smoky Mountains, Tennessee, 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@N05/37047435501 (archive). It was reviewed on 28 January 2020 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 | 02:23, 28 January 2020 | | 3,008 × 2,000 (5.74 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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