File:Diplocraterion trace fossil (Kope Formation, Upper Ordovician; Maysville West roadcut, Mason County, Kentucky, USA) 1.jpg
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English: Diplocraterion sp. - trace fossil in limestone from the Ordovician of Kentucky, USA.
This trace fossil-bearing rock is from 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 limestones and shales. Most of the limestones are event beds (= tempestites), deposited during ancient storms. Trace fossils are any indirect evidence of ancient life. They refer to features in rocks that do not represent parts of the body of a once-living organism. Traces include footprints, tracks, trails, burrows, borings, and bitemarks. Body fossils provide information about the morphology of ancient organisms, while trace fossils provide information about the behavior of ancient life forms. Interpreting trace fossils and determining the identity of a trace maker can be straightforward (for example, a dinosaur footprint represents walking behavior) or not. Sediments that have trace fossils are said to be bioturbated. Burrowed textures in sedimentary rocks are referred to as bioturbation. Trace fossils have scientific names assigned to them, in the same style & manner as living organisms or body fossils. Seen here is a limestone bedding plane with Diplocraterion, a distinctive U-tube shaped trace fossil (as seen in cross-section). In bedding plane view, it is often a dumbbell-shaped structure. It is moderately common in the Cincinnatian Series. U-tubes having parallel sides have been called Diplocraterion parallelum. U-tubes having a flared base have been called Diplocraterion helmerseni. Specimens having a pair of blind pouches at the bottom of the U-tube have been called Diplocraterion biclavatum. Stratigraphy: float from the Taylor Mill Submember, McMicken Member, upper Kope Formation, lower Cincinnatian Series, Upper Ordovician Locality: Jersey Ridge outcrop (= Harsha Bridge South outcrop; = Maysville West outcrop) - western side of Rt. 62/Rt. 68 roadcut through Jersey Ridge, just south of the Harsha Bridge over the Ohio River, northern Kentucky, USA (~vicinity of 38° 40’ 27.27" North latitude, 83° 47' 53.11" West longitude) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50659587171/ |
| 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@N05/50659587171. It was reviewed on 30 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 15:45, 30 November 2020 | | 3,754 × 2,419 (5.48 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50659587171/ with UploadWizard |
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