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File:Waynesville Formation over Arnheim Formation (Upper Ordovician; Roaring Run, Warren County, Ohio, USA) 1 (31611911268).jpg

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Shales & nodular limestones in the Ordovician of Ohio, USA.

This outcrop is in the famous Cincinnatian Series of the tristate area of Ohio-Kentucky-Indiana. Rocks in the Cincinnatian were deposited in relatively shallow marine facies during the Late Ordovician. The Cincinnatian succession is mostly interbedded fossiliferous limestones and shales. Most of the limestones are event beds (= tempestites), deposited during ancient storms. The exposure seen here consists of dark gray shales of the lowermost Waynesville Formation (= upper half of the photo) overlying interbedded shales and nodular limestones of the uppermost Arnheim Formation (= lower half of the photo).

Stratigraphy: basal Waynesville Formation over the uppermost Arnheim Formation, lower Richmondian Stage, upper Cincinnatian Series, upper Upper Ordovician

Locality: creek cut along Roaring Run, just west of the western end of Caesar Creek Lake's emergency spillway, Caesar Creek Lake State Park, northeastern Warren County, southwestern Ohio, USA (~vicinity of 39° 28' 41.63" North latitude, 84° 03' 46.83" West longitude)
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Source Waynesville Formation over Arnheim Formation (Upper Ordovician; Roaring Run, Warren County, Ohio, USA) 1
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/31611911268 (archive). It was reviewed on 7 November 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 November 2018

James St. John

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current00:31, 7 November 2018Thumbnail for version as of 00:31, 7 November 20183,000 × 4,000 (8.7 MB)Lu Brito (talk | contribs)Transferred from Flickr via #flickr2commons

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