File:Fossil burrows (upper Cave Branch Member, Slade Formation, Upper Mississippian; Clack Mountain Road Outcrop, south of Morehead, Kentucky, USA) 1 (31437290027).jpg
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Fossil burrows in limestone in the Mississippian of Kentucky, USA. This slab is eroded from an outcrop of Upper Mississippian Slade Formation in Kentucky. The unit was formerly known as the Newman Limestone ("They always change the names to protect the innocent!"). Slade Formation limestones are shallow ocean deposits. Seen here is a a talus piece of limestone from the upper Cave Branch Member, which is a gray shale-rich interval having interbedded thin, fine-grained limestones deposited in an ancient intertidal environment. From Ettensohn & Lierman (1992): [The] overlying parts of the Cave Branch Member here include dark-gray shales and interbedded calcilutites, which contain laminae, flaser-beds, mudcracks, runzelmarken, as well as vertical and horizontal burrows. This part of the Cave Branch represents a transgressive tidal mud-flat deposit on the leading edge of an early to middle Chesterian transgressing sea represented by the upper Cave Branch-through-Maddox Branch members of the Slade, all of which are exposed here. The dark-gray shales in tidal parts of the Cave Branch probably represent reworked soils from the underlying [paleosol] deposit. The squiggly markings on this bedding plane are trace fossils - specifically, horizontal burrows. 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 determination of 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. Stratigraphy: upper Cave Branch Member, Slade Formation, Upper Mississippian Locality: roadcut next to the Clack Mountain Road-Route 519 intersection, south of Morehead, Kentucky, USA (vicinity of 38° 07’ 41.87” North latitude, 83° 24’ 47.04” West longitude) |
| Date | |
| Source | Fossil burrows (upper Cave Branch Member, Slade Formation, Upper Mississippian; Clack Mountain Road Outcrop, south of Morehead, Kentucky, USA) 1 |
| 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@N05/31437290027 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:34, 7 December 2019 | | 4,000 × 2,841 (7.25 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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