File:Tentaculite in Devonian limestone (48873661118).jpg
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Summario
DescriptionTentaculite in Devonian limestone (48873661118).jpg |
Tentaculites are problematic fossils - their high-level taxonomic placement is uncertain, but they may be molluscs. Tentaculite fossils consist of small to very small calcitic shells. The shells are straight to slightly curving and are slightly tapering tubes. The pointed end of the shell is closed. In some forms, the pointed end is slightly bulbous, with an apical spine (usually broken off). Externally, tentaculite shells usually have ringed ornament and thin, delicate, longitudinal striations. The tip of the shell is the embryonic part. After that is the juvenile portion of the shell, which consists of internal septa, or walls that divide the shell into chambers. Septa have no external expression and number 5 to 20 in one specimen. The adult portion of the shell is nonseptate - it is referred to as the living chamber, which occupies more than half the entire length of the shell. No aperture-like structure has ever been found at the distal end of the shell. The soft-part morphology of tentaculites is poorly known. X-ray images of specimens from the Lower Devonian of Germany seem to show multiple "tentacles" protruding from the large end of the shell. Muscle impressions on the interior have been reported in some tentaculites. Tentaculites are entirely extinct - their geologic range depends on how inclusive the term "tentaculite" is. Tentaculites first definitely appear in Ordovician rocks. Their maximum abundance and diversity was during the Devonian. Tentaculites were entirely marine. They are known from shallow and deep-water deposits. Larger, thick-shelled forms are local in their distribution, and so appear to have been benthic. Smaller, thin-shelled forms have world-wide distributions, and so appear to have been planktonic. Planktonic forms, such as the styliolinids, may not be tentaculites at all. Sometimes, encrusters are found on tentaculite shells. The distribution of encrusting organisms suggests that benthic tentaculites had the apex of the shell pointed downward and the aperture was upward during life. Almost all tentaculite fossils are found parallel to bedding. Very few have been found with the pointed end of the shell vertically inserted into the sediments. Classification: Animalia incertae sedis, Tentaculita, Tentaculitida, Tentaculitidae Locality: building stone at Marion Depot, Marion, Ohio, USA |
Data | |
Origine | Tentaculite in Devonian limestone |
Autor | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/48873661118 (archive). It was reviewed on 7 de decembre 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
7 de decembre 2019
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copyright status anglese
copyrighted anglese
inception anglese
14 septembre 2019
captured with anglese
Canon PowerShot D10 anglese
source of file anglese
exposure time anglese
0.01666666666666666666 secunda
f-number anglese
10
focal length anglese
9,681 millimetro
ISO speed anglese
80
photograph anglese
media type anglese
image/jpeg
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Data/Hora | Miniatura | Dimensiones | Usator | Commento | |
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actual | 19:10, 7 decembre 2019 | 1 871 × 1 006 (1,86 MB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
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Fabricante del camera | Canon |
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Modello del camera | Canon PowerShot D10 |
Tempore de exposition | 1/60 sec (0,016666666666667) |
Numero F | f/10 |
Classification de velocitate ISO | 80 |
Data e hora del generation del datos | 12:42, 14 septembre 2019 |
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Altitude | 3 000 px |
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Resolution horizontal | 180 dpi |
Resolution vertical | 180 dpi |
Software usate | Adobe Photoshop Elements 16.0 (Macintosh) |
Data e hora de modification del file | 02:52, 10 octobre 2019 |
Positionamento Y e C | Co-situate |
Version de Exif | 2.21 |
Data e hora del digitalisation | 12:42, 14 septembre 2019 |
Significato de cata componente |
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Flash | Flash ha fulgurate, activation del flash fortiate, modo de reduction de oculos rubie |
Version supportate de Flashpix | 1 |
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Unitate del resolution del plano focal | uncias |
Methodo de sensor | Sensor de area de colores a singule chip |
Origine del file | Camera photographic digital |
Processamento de imagines personalisate | Processo normal |
Modo de exposition | Exposition manual |
Balancia de blanc | Balancia de blanc automatic |
Ration de zoom digital | 1 |
Typo de captura de scena | Portrait |
Objectivo usate | 6.2-18.6 mm |
Data del ultime modification del metadatos | 22:52, 9 octobre 2019 |
ID unic del documento original | 618FA6612BDC9B31AA1B07AC8CFAC821 |