File:Megastrophia concava (fossil brachiopod) (Silica Formation, Middle Devonian; quarry at Sylvania, Ohio, USA) 1 (36697604723).jpg
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[edit]DescriptionMegastrophia concava (fossil brachiopod) (Silica Formation, Middle Devonian; quarry at Sylvania, Ohio, USA) 1 (36697604723).jpg |
Megastrophia concava (Hall, 1857) - fossil brachiopod from the Devonian of Ohio, USA. (centimeter scale) 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). This is the exterior of a ventral valve of a moderately large strophomenid brachiopod called Megastrophia concave. It is a common species in the richly fossiliferous Silica Formation of northwestern Ohio and southeastern Michigan. This Middle Devonian unit consists of interbedded shales, calcareous shales, argillaceous limestones, and fossiliferous limestones. Common fossils include brachiopods, bryozoans, crinoids, trilobites, and other typical Paleozoic marine faunas. Click on the above photo to zoom in and look around. In the upper part of the fossil, the shell is covered with a pitted structure. That is an encrusting sheet-like bryozoan. Bryozoans, or "moss animals", are colonial lophophorates that are common in the Paleozoic and Mesozoic fossil records. They are still alive in modern oceans. Many make a hard, calcareous skeleton that is readily preserved as a fossil, although usually in a fragmented state. Encrusting bryozoans on shells and hardgrounds usually allow for examination of complete colonies. Some encrusting bryozoans consist of a just a holdfast with the upright portion of the colony detached (broken away). Classification: Animalia, Brachiopoda, Articulata (a.k.a. Rhynchonelliformea), Strophomenata, Strophomenida, Strophodontidae Stratigraphy: Silica Formation (a.k.a. Silica Shale), Middle Devonian Locality: commercial quarry in the Sylvania area, northwestern Ohio, USA |
Date | |
Source | Megastrophia concava (fossil brachiopod) (Silica Formation, Middle Devonian; quarry at Sylvania, 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@N05/36697604723 (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. |
7 December 2019
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current | 19:06, 7 December 2019 | ![]() | 1,999 × 2,070 (2.61 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 15:21, 10 April 2017 |
Lens focal length | 11.614 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 04:44, 28 September 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 15:21, 10 April 2017 |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
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Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
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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 | 00:44, 28 September 2017 |
Unique ID of original document | B0A9C775B6316A4B6FA3D787F5A8644B |