File:Ophiomorpha burrow in poorly indurated clayey sandstone (Citronelle Formation, Pliocene; Bay Bluffs Park, Pensacola, Florida, USA) 6.jpg
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[edit]DescriptionOphiomorpha burrow in poorly indurated clayey sandstone (Citronelle Formation, Pliocene; Bay Bluffs Park, Pensacola, Florida, USA) 6.jpg |
English: Ophiomorpha burrow in iron oxide-stained, poorly indurated clayey sandstone in the Pliocene of Florida, USA. (photo taken by James Cheshire) (Ophiomorpha burrow is ~2.5 cm across at its widest)
The Citronelle Formation is a Pliocene-aged unit of nonindurated to poorly indurated, siliciclastic sedimentary rocks. It is widely distributed in the Gulf of Mexico coastal plain areas of Georgia, Florida, Alabama, Mississippi, Louisiana, and Texas. Most of this unit represents nonmarine deltaic deposits, but marine fossils have been reported from some localities. The outcrop shown above has an Ophiomorpha burrow (= whitish, circular structure at center left), a common trace fossil in upper Mesozoic and Cenozoic shallow marine lithofacies. Ophiomorpha burrows are constructed by callianassid shrimp, which are burrowing crustacean arthropods. The whitish material making up the Ophiomorpha burrow lining is kaolinite clay (see Means, 2009). The reddish and reddish-brown coloration is from iron oxide staining - principally hematite (Fe2O3). Stratigraphy: Citronelle Formation, Pliocene Locality: Bay Bluffs Park, Pensacola, far-northwestern Florida, USA Reference cited: Means, G.H. 2009. A Marine-Influenced Siliciclastic Unit (Citronelle Formation) in Western Panhandle Florida. M.S. thesis. Florida State University. 134 pp. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/16754491766/ |
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@N05/16754491766. It was reviewed on 28 April 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
28 April 2022
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current | 14:27, 28 April 2022 | 2,004 × 1,708 (3.26 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/16754491766/ with UploadWizard |
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Camera manufacturer | NIKON |
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Camera model | E4600 |
Exposure time | 5/396 sec (0.012626262626263) |
F-number | f/5 |
ISO speed rating | 50 |
Date and time of data generation | Unknown date |
Lens focal length | 6.4 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 21:12, 10 March 2015 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
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Image compression mode | 2 |
APEX exposure bias | −0.7 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 38 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Image width | 2,004 px |
Image height | 1,708 px |
Date metadata was last modified | 17:12, 10 March 2015 |
IIM version | 2 |