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File:Graded bedding (Wilhite Formation, Neoproterozoic; Kinzel Springs, Tennessee, USA) 2 (40920514014).jpg

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Graded bedding from the Precambrian of Tennessee, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)

Graded bedding is a type of sedimentary structure that consists of a change in grain size within a bed. Normal graded bedding is the more common of the two varieties - it has larger grains at the bottom and smaller grains at the top. This usually forms after a local flood or storm. The pebble horizon near the bottom of the photo marks the base of a bed - it grades upward from conglomeratic sandstone to pebbly sandstone to sandstone

Stratigraphy: Wilhite Formation, upper Walden Creek Group, Ocoee Supergroup, upper Neoproterozoic (studies that concluded an Ordovician to Silurian age for the Walden Creek Group are apparently erroneous - see Kelly, 2014)

Locality: unrecorded/undisclosed site at or near the town of Kinzel Springs, Blount County, far-eastern Tennessee, USA

Reference cited:

Kelly (2014) - Age of the Walden Creek Group, Western Blue Ridge Province: Resolving a Decades-Old Controversy via Detrital Mineral Geochronology and Sedimentary Provenance Analysis. M.S. thesis. University of Kentucky. 120 pp.
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Source Graded bedding (Wilhite Formation, Neoproterozoic; Kinzel Springs, Tennessee, USA) 2
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@N05/40920514014. 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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current02:18, 6 December 2019Thumbnail for version as of 02:18, 6 December 20194,000 × 3,000 (6.17 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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