File:Shales (Nada Member, Borden Formation, Lower Mississippian; Rt. 1274-Rt. 801 outcrop, southwest of Morehead, Kentucky, USA) 5 (32719637858).jpg

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Weathered shales in the Mississippian of Kentucky, USA.

The mottled maroon and gray shales seen here are part of an ancient deltaic complex called the Borden Formation. The Borden is a significant unit in the Lower Mississippian of Kentucky, Indiana, and Ohio. Prodeltaic, delta front, and delta top deposits are present. Named members in eastern Kentucky include (from bottom to top) the Henley Member (or Henley Bed), Farmers Member, Nancy Member, Cowbell Member, and Nada Member. This outcrop near Morehead, Kentucky consists of fine-grained siliciclastics of the Nada and coarser-grained siliclciastics of the Cowbell below that.

The top of the Nada Member (where the gray ledge starts in the photo) is a significant disconformity, with the Upper Mississippian Slade Formation (formerly the Newman Limestone) occurring above. The entire Middle Mississippian is gone here. The gray ledge at the top is the Warix Run Member of the Slade Formation, a cross-bedded calcarenite limestone unit.

Stratigraphy: Nada Member, upper Borden Formation, Osagean Stage/Series, upper Lower Mississippian

Locality: roadcut next to the Route 1274-Route 801 intersection, southwest of the town of Morehead, Kentucky, USA. (vicinity of 38° 04’ 51.58” North latitude, 83° 25’ 21.64” West longitude)
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Source Shales (Nada Member, Borden Formation, Lower Mississippian; Rt. 1274-Rt. 801 outcrop, southwest of Morehead, Kentucky, USA) 5
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@N05/32719637858 (archive). It was reviewed on 8 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

8 October 2019

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current04:00, 8 October 2019Thumbnail for version as of 04:00, 8 October 20194,000 × 3,000 (6.12 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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