File:Leptaena fossil brachiopod in fossiliferous limestone (Columbus Limestone; Middle Devonian; Ohio, USA) 1 (41448522694).jpg
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[edit]DescriptionLeptaena fossil brachiopod in fossiliferous limestone (Columbus Limestone; Middle Devonian; Ohio, USA) 1 (41448522694).jpg |
Leptaena fossil brachiopod in fossiliferous limestone from the Devonian of Ohio, USA. The Columbus Limestone is a significant carbonate unit in the Devonian of central and northern Ohio. It's actually part of a much more widespread sheet of Devonian carbonates that extends from New York State to the Midwest. The Columbus Limestone represents deposition in a subtropical, shallow-water, carbonate platform environment. The rocks are principally micritic limestones, fossiliferous wackestones, and fossiliferous packstones. Some chert nodules are present in the unit. Fossils are typical Paleozoic shallow marine invertebrates - favositid corals, rugose corals, stromatoporoids, brachiopods, crinoids, blastoids, bryozoans, trilobites, bivalves, gastropods, cephalopods, rostroconchs, and tentaculites. Microfossils include conodonts and charophyte oogonia. Other fossils in the Columbus Limestone include vertebrates (fish), land plants (rare), and trace fossils. Some horizons in the Columbus Limestone have silicified or partially silicified fossils. The fossil shown above is a distinctive strophomenid brachiopod called Leptaena. It is characterized by having prominent concentric wrinkles on both the dorsal and ventral valves. This genus has been reported from the Ordovician to the Mississippian. Brachiopods are sessile, benthic, filter-feeding, marine invertebrates. They first appear in Cambrian rocks and were abundant in Earth's oceans throughout the Paleozoic. They were also common in Mesozoic oceans, but are scarce in modern oceanic biotas. Brachiopods have two shells, called valves, that are usually calcareous (made of calcite - CaCO3 - calcium carbonate). Each shell of a brachiopod is bilaterally symmetrical, unlike each shell of a bivalve (clam). Classification: Animalia, Brachiopoda, Articulata (a.k.a. Rhynchonelliformea), Strophomenida, Rafinesquinidae Stratigraphy: Columbus Limestone, Middle Devonian Provenance: unknown, but possibly from a central Ohio quarry Locality: large loose slab on the grounds of the Ohio Department of Natural Resources, Columbus, Ohio, USA |
Date | |
Source | Leptaena fossil brachiopod in fossiliferous limestone (Columbus Limestone; Middle Devonian; Ohio, 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@N05/41448522694 (archive). It was reviewed on 12 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
12 October 2019
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current | 04:34, 12 October 2019 | 4,000 × 3,000 (7.07 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Date and time of data generation | 07:14, 14 April 2018 |
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Image title | |
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Horizontal resolution | 180 dpi |
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Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 08:40, 17 May 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 07:14, 14 April 2018 |
Meaning of each component |
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Maximum land aperture | 2.96875 APEX (f/2.8) |
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File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 04:40, 17 May 2018 |
Unique ID of original document | 38C822C8423357836DF1E3E9AD23584D |
IIM version | 32,767 |