File:Neuropteris flexuosa fossil plant (Mazon Creek Lagerstatte, Francis Creek Shale, Middle Pennsylvanian; coal mine dump pile near Essex, northern Illinois, USA) (14910119354).jpg
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[edit]DescriptionNeuropteris flexuosa fossil plant (Mazon Creek Lagerstatte, Francis Creek Shale, Middle Pennsylvanian; coal mine dump pile near Essex, northern Illinois, USA) (14910119354).jpg |
Neuropteris flexuosa Sternberg, 1823 fossil plant from the Pennsylvanian of Illinois, USA (public display, FMNH PF 46204, 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 Neuropteris flexuosa, a fossil seed fern. Seed ferns are not true ferns. Seed ferns were odd, usually arborescent (tree-like) plants that had woody trunks, large fronds bearing fern-like foliage, and reproduced using seeds (not the spores of true ferns). Classification: Plantae, Pteridospermophyta, Medullosales 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 | Neuropteris flexuosa fossil plant (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@N05/14910119354. 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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ISO speed rating | 320 |
Date and time of data generation | 17:07, 21 August 2010 |
Lens focal length | 18.6 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 20:30, 13 October 2014 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 17:07, 21 August 2010 |
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Maximum land aperture | 4.59375 APEX (f/4.91) |
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File source | Digital still camera |
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Date metadata was last modified | 16:30, 13 October 2014 |
IIM version | 2 |