File:Bandringa rayi fossil shark, Mazon Creek Lagerstatte.jpg
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Summary
DescriptionBandringa rayi fossil shark, Mazon Creek Lagerstatte.jpg |
Bandringa rayi Zangerl, 1969 fossil shark from the Pennsylvanian of Illinois, USA (public display, FMNH PF 5686, Field Museum of Natural History, Chicago, Illinois, USA) (~10.7 cm across). One of the most remarkable soft-bodied fossil deposits (lagerstätten) on Earth is the Pennsylvanian-aged Mazon Creek Lagerstätte near Chicago, Illinois. In the Mazon Creek area, the Francis Creek Shale consists of concretionary gray shales. The Francis Creek concretions are composed of argillaceous ironstone, and can be fossiliferous or nonfossiliferous. The fossiliferous concretions contain land plants and terrestrial & marine animals, including nonmineralizing organisms. This bizarre-looking fossil shark is the holotype specimen of Bandringa rayi. Its size and lack of developed cartilaginous skeletal structures indicate that this is a juvenile shark. It has an extremely elongated snout, well-preserved eyespots, and a set of very small teeth arranged in a V-pattern (discernible as two light-grayish lines extending in the 2-o’clock and 3:30 directions from the lower eyespot). This rare species has been reported from the Mazon Creek deposit of Illinois and from Cannelton, Pennsylvania, USA. Classification: Animalia, Chordata, Vertebrata, Chondrichthyes, Elasmobranchii, Eusealchii, Ctenacanthiformes, Ctenacanthoidea, Bandringidae Stratigraphy: Mazon Creek Lagerstätte, Francis Creek Shale Member, Carbondale Formation, Desmoinesian Stage (= Westphalian D), upper Middle Pennsylvanian Locality: coal mine dump pile near Essex, northern Illinois, USA |
Date | |
Source | Bandringa rayi fossil shark (Mazon Creek Lagerstatte, Francis Creek Shale, Middle Pennsylvanian; coal mine dump pile near Essex, northern Illinois, USA) 2 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15344615908. It was reviewed on 3 November 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
3 November 2014
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11 June 2010
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Date/Time | Dimensions | User | Comment | |
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current | 16:16, 3 November 2014 | 2,549 × 1,256 (1.04 MB) | Tillman | Transferred from Flickr via Flickr2commons |
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Exposure time | 1/60 sec (0.016666666666667) |
F Number | f/5.6 |
Date and time of data generation | 11:38, 11 June 2010 |
Lens focal length | 200 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 20:11, 13 October 2014 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 11:38, 11 June 2010 |
Meaning of each component |
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APEX exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
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DateTime subseconds | 90 |
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DateTimeDigitized subseconds | 90 |
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File source | Digital still camera |
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Focal length in 35 mm film | 300 mm |
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Image width | 2,549 px |
Image height | 1,256 px |
Date metadata was last modified | 16:11, 13 October 2014 |