File:Daemonelix burrow (Harrison Formation, Middle Miocene; Sioux County, northwestern Nebraska, USA) (15358318158).jpg
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Summary
DescriptionDaemonelix burrow (Harrison Formation, Middle Miocene; Sioux County, northwestern Nebraska, USA) (15358318158).jpg |
Daemonelix burrow from the Miocene of Nebraska, USA (reproduction, public display, Field Museum of Natural History, Chicago, Illinois, USA). Daemonelix burrows are commonly called “Devil’s corkscrews”. These distinctive, large, spiral burrows were made by an ancient species of terrestrial beaver. The spiraled portion of these trace fossils is usually about 1.5 to 2 meters tall. The base of the spiraled portion merges with a subhorizontal tube. The burrows are filled with siliciclastic sediments that are better cemented compared with surrounding materials. Stratigraphy: paleosol in the Harrison Formation, upper Middle Miocene Locality: Sioux County, northwestern Nebraska, USA Trace fossils are any indirect evidence of ancient life. They refer to features in rocks that do not represent parts of the body of a once-living organism. Traces include footprints, tracks, trails, burrows, borings, and bitemarks. Body fossils provide information about the morphology of ancient organisms, while trace fossils provide information about the behavior of ancient life forms. Interpreting trace fossils and determination of the identity of a trace maker can be straightforward (for example, a dinosaur footprint represents walking behavior) or not. Sediments that have trace fossils are said to be bioturbated. Burrowed textures in sedimentary rocks are referred to as bioturbation. Trace fossils have scientific names assigned to them, in the same style & manner as living organisms or body fossils. |
Date | |
Source | Daemonelix burrow (Harrison Formation, Middle Miocene; Sioux County, northwestern Nebraska, 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@N05/15358318158. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 May 2015
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21 August 2010
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:21, 6 May 2015 | ![]() | 1,696 × 3,696 (1.69 MB) | Natuur12 | Transferred from Flickr via Flickr2Commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/2.8 |
ISO speed rating | 250 |
Date and time of data generation | 17:32, 21 August 2010 |
Lens focal length | 6.2 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 15:23, 15 October 2014 |
Exif version | 2.2 |
Date and time of digitizing | 17:32, 21 August 2010 |
Image compression mode | 3 |
Shutter speed | 5.90625 |
APEX aperture | 2.96875 |
Exposure bias | 0 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.90625 |
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Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Supported Flashpix version | 1 |
Image width | 1,696 px |
Image height | 3,696 px |
Date metadata was last modified | 11:23, 15 October 2014 |