File:Black shales & gray shales (Morgan Trail Member over Selmier Member, New Albany Shale, Upper Devonian; drill core from Kavanaugh - 1-3 well, Daviess County, Indiana, USA) 2.jpg
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English: Black shales & gray shales from the Devonian of Indiana, USA. (on display in New Albany, Indiana during the 24-25 September 2004 annual field conference of the Great Lakes Section, Society of Economic Paleontologist and Mineralogists; up-section is to the left; ~0.107 meters of section seen here)
Black shale at left = basal Morgan Trail Member Gray shale at center & right = uppermost Selmier Member This is a core through part of the New Albany Shale, a Devonian-aged formation in Kentucky, Indiana, Illinois, and eastern Missouri. The unit is dominated by dark-colored marine mudshales of Late Devonian age. These black shales were deposited in a moderately deep, anoxic seafloor environment. This was a widespread lithofacies during the Late Devonian's Global Anoxia Event. The New Albany Shale is equivalent to the Ohio Shale, the Antrim Shale, and the Chattanooga Shale in surrounding states. The New Albany Shale's member terminology varies from region to region. In southwestern Indiana, where this core was drilled, the New Albany consists of (from the base upward): Blocher Member, Selmier Member, Morgan Trail Member, Camp Run Member, and Clegg Creek Member. Caption that accompanied this particular core display: At the top of the Selmier occurs an abrupt change from gray bioturbated shale to massive, banded, and pyritic black shale. The knife-sharp contact corresponds to a sharp increase in gamma-ray counts and marks the erosive contact between the Selmier Member and the overlying Morgan Trail Member. Based on conodont studies on comparable strata, the boundary between the Selmier and Morgan Trail Members coincides with the Frasnian-Famennian boundary. Stratigraphy: Morgan Trail Member (left) over Selmier Member (center & right), New Albany Shale, uppermost Frasnian Stage to lowermost Famennian Stage, middle Upper Devonian Locality: drill core (about midway through the section from 633.78 to 634.54 meters depth), Kavanaugh # 1-3 well, south-southwest of the town of Montgomery, Barr Township, Daviess County, southwestern Indiana, USA (38° 38' 20" North latitude, 87° 03' 43" West longitude) |
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| Source | https://www.flickr.com/photos/47445767@N05/52859842182/ |
| 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@N05/52859842182. It was reviewed on 2 May 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 16:54, 2 May 2023 | | 1,108 × 789 (615 KB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52859842182/ with UploadWizard |
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