File:Anthracomedusa turnbulli fossil jellyfish (Mazon Creek Lagerstatte, Francis Creek Shale, Middle Pennsylvanian; coal mine dump pile near Essex, northern Illinois, USA).jpg
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editDescriptionAnthracomedusa turnbulli fossil jellyfish (Mazon Creek Lagerstatte, Francis Creek Shale, Middle Pennsylvanian; coal mine dump pile near Essex, northern Illinois, USA).jpg |
Anthracomedusa turnbulli Johnson & Richardson, 1968 fossil jellyfish from the Pennsylvanian of Illinois, USA (public display, FMNH PE 38977, Field Museum of Natural History, Chicago, Illinois, USA). 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 is a rare example of a fossil cubozoan jellyfish. Cubozoans are also called “box jellyfish", in reference to their perceived subquadrate bell shape. Some of the most venomous marine animals in modern oceans include species of box jellyfish. This specimen has been compressed perpendicular to the oral-aboral axis of the jellyfish body. The central structure is the bell. Anthracomedusa had four tufts of tentacles near the periphery of the body - those are the irregularly linear structures near the margin of the concretion. Classification: Animalia, Cnidaria, Cubozoa, Carybdeida, Carybdeidae 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 | Anthracomedusa turnbulli fossil jellyfish (Mazon Creek Lagerstatte, Francis Creek Shale, Middle Pennsylvanian; coal mine dump pile near Essex, northern Illinois, USA) |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15506056466. It was reviewed on 21 November 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
21 November 2014
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Camera manufacturer | Canon |
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Date and time of data generation | 17:10, 21 August 2010 |
Lens focal length | 9.681 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 14:56, 13 October 2014 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 17:10, 21 August 2010 |
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File source | Digital still camera |
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Supported Flashpix version | 1 |
Image width | 3,132 px |
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Date metadata was last modified | 10:56, 13 October 2014 |
IIM version | 2 |