File:Rusophycus (trilobite burrow) (Ordovician-Silurian boundary section, Route 41 roadcut at Ohio Brush Creek, Adams County, Ohio, USA) 2.jpg
![File:Rusophycus (trilobite burrow) (Ordovician-Silurian boundary section, Route 41 roadcut at Ohio Brush Creek, Adams County, Ohio, USA) 2.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/88/Rusophycus_%28trilobite_burrow%29_%28Ordovician-Silurian_boundary_section%2C_Route_41_roadcut_at_Ohio_Brush_Creek%2C_Adams_County%2C_Ohio%2C_USA%29_2.jpg/800px-Rusophycus_%28trilobite_burrow%29_%28Ordovician-Silurian_boundary_section%2C_Route_41_roadcut_at_Ohio_Brush_Creek%2C_Adams_County%2C_Ohio%2C_USA%29_2.jpg?20201013015447)
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editDescriptionRusophycus (trilobite burrow) (Ordovician-Silurian boundary section, Route 41 roadcut at Ohio Brush Creek, Adams County, Ohio, USA) 2.jpg |
English: 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.
Trace fossils are also called ichnofossils. The study of traces and trace fossils is ichnology. The trace fossil seen here is a convex hyporelief - it is on the bottom surface of a bed. This burrowing trace was made by a trilobite, likely engaged in the search for food. Trilobites are extinct marine arthropods. They first appear in Lower Cambrian rocks and the entire group went extinct at the end of the Permian. Trilobites had a calcite exoskeleton and nonmineralized parts underneath (legs, gills, gut, etc.). The calcite skeleton is most commonly preserved in the fossil record, although soft-part preservation is known in some trilobites (Ex: Burgess Shale and Hunsruck Slate). Trilobites had a head (cephalon), a body of many segments (thorax), and a tail (pygidium). Molts and carcasses usually fell apart quickly - most trilobite fossils are isolated parts of the head (cranidium and free cheeks), individual thoracic segments, or isolated pygidia. The name "trilobite" was introduced in 1771 by Johann Ernst Immanuel Walch and refers to the tripartite division of the trilobite body - it has a central axial lobe that runs longitudinally from the head to the tail, plus two side lobes (pleural lobes). Classification of trace maker: Animalia, Arthropoda, Trilobita, Polymerida Stratigraphy: float from an Ordovician-Silurian boundary section - derived from either the uppermost Drakes Formation (Upper Ordovician) or the lower Brassfield Formation (Lower Silurian) Locality: roadcut on the western side of Route 41, just south of bridge over Ohio Brush Creek, central Adams County, southern Ohio, USA (38° 53.636' North latitude, 83° 27.177' West longitude) |
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Source | https://www.flickr.com/photos/47445767@N05/50021004998/ |
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@N05/50021004998. It was reviewed on 13 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
13 October 2020
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current | 01:54, 13 October 2020 | ![]() | 2,545 × 1,654 (3.46 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50021004998/ with UploadWizard |
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Camera manufacturer | Canon |
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ISO speed rating | 80 |
Date and time of data generation | 01:51, 15 June 2020 |
Lens focal length | 11.614 mm |
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Number of components | 3 |
Horizontal resolution | 180 dpi |
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Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 00:44, 19 June 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 01:51, 15 June 2020 |
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Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 20:44, 18 June 2020 |
Unique ID of original document | 17FDE636C0C942EF0A3EADE2223063BA |