Skolithos linearis burrows in sandstone (Clinch Formation, Lower Silurian; Clinch Mountain, Tennessee, USA) 13 : 無料・フリー素材/写真
Skolithos linearis burrows in sandstone (Clinch Formation, Lower Silurian; Clinch Mountain, Tennessee, USA) 13 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Skolithos linearis (Haldeman, 1840) - vertical burrows in sandstone from the Silurian of Tennessee, USA. (oblique bedding plane & cross-section view)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.Many shallow-water quartzose sandstones have conspicuous, long, vertical burrows called Skolithos linearis. Geologists traditionally consider Skolithos as a burrow of a filter-feeding vermiform organism in a shallow-water, high-energy lithofacies. Most Skolithos occurrences in the geologic record may be safely interpreted as such, but some demonstrably terrestrial examples constructed by other organisms have been discovered (e.g., see Martin, 2006).The rock with Skolithos trace fossils seen here is often called "piperock". The host rock itself is frequently referred to as "quartzite", even though it's not metamorphic. Very hard, extremely well-cemented quartzose sandstones such as this do mimic true metamorphic quartzites in their physical characteristics.Stratigraphy: Clinch Formation ("Clinch Quartzite"), Lower SilurianLocality: loose piece from erosion control piles on the northern side of Rt. 25E, southern side of Clinch Mountain, WNW of the town of Bean Station, northeastern Grainger County, northeastern Tennessee, USA (36° 21' 34.12" North latitude, 83° 21' 05.77" West longitude) [It is unclear where the erosion control rocks came from, but they are possibly from Clinch Mountain itself.]--------------References: Haldeman (1840) - Supplement to Number One of “A Monograph of the Limniades, or Freshwater Univalve Shells of North America,” Containing Descriptions of Apparently New Animals in Different Classes, and the Names and Characters of the Subgenera in Paludina and Anculosa. Philadelphia. 3 pp. [= “Miscellaneous Pamphlets on Natural History 14”]Martin (2006) - Trace Fossils of San Salvador. San Salvador, Bahamas. Gerace Research Center. 80 pp. |
| 撮影日 | 2021-11-01 00:21:14 |
| 撮影者 | James St. John |
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