File:Thunderhead Sandstone (Neoproterozoic; The Sinks, Great Smoky Mountains, Tennessee, USA) 11 (36869169051).jpg

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Summary

Description

Sandstone in the Precambrian of Tennessee, USA.

This photo shows the Little River flowing by outcrops 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 in this area 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: "The Sinks" along the Little River, Great Smoky Mountains National Park, southwestern Sevier County (next to the Blount County line), eastern Tennessee, USA (35° 40’ 09.38" North latitude, 83° 39’ 44.57” West longitude)
Date
Source Thunderhead Sandstone (Neoproterozoic; The Sinks, Great Smoky Mountains, Tennessee, USA) 11
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@N05/36869169051. 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.

6 December 2019

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current20:14, 5 December 2019Thumbnail for version as of 20:14, 5 December 20193,008 × 2,000 (5.83 MB)imagescommonswiki>Ser Amantio di NicolaoTransferred from Flickr via #flickr2commons

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