File:Interbedded black and gray shales (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: Interbedded black and 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; ~0.389 meters of section seen here)
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: Black-gray shale cycles in the Selmier Member. Note the presence of a centimeter-thick shelly lag [= right side of the first whitish bed at far-left] . . . Lags and knife-sharp contacts at the base of black shale beds are common through the Slemier and support the idea of a relatively shallow sea where mud deposition was affected by sea level fluctuations and storm deposits. Gamma-ray intensity in the Selmier is highest in the basal third and considerably lower in the middle and upper portions of the member. This upward change in gamma-ray intensity corresponds to a change from massive black shale to gray bioturbated shales with inerbedded black shales. Stratigraphy: Selmier Member, Frasnian Stage, New Albany Shale, lower Upper Devonian Locality: drill core (~637.37 to 637.76 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) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/52861095689/ |
| 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@N05/52861095689. 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 | | 1,171 × 312 (346 KB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52861095689/ with UploadWizard |
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