File:Dinosaur footprints (Dakota Sandstone, Lower Cretaceous; Dinosaur Ridge, Colorado, USA) 5 (22023336419).jpg
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Summary
[edit]DescriptionDinosaur footprints (Dakota Sandstone, Lower Cretaceous; Dinosaur Ridge, Colorado, USA) 5 (22023336419).jpg |
Dinosaur tracksite in the Cretaceous of Colorado, USA. The outcrop shown above is part of Dinosaur Ridge (a section of the Dakota Hogback), which is a north-south trending ridge of eastward-dipping Mesozoic sedimentary rocks. Triassic, Jurassic, and Cretaceous rocks are present, tilted by Laramide Orogeny uplift during the Cenozoic (the Front Range of the Colorado Rocky Mountains is immediately west of here). This exposure consists of structurally tilted beds of the Dakota Sandstone, a Lower Cretaceous succession of nearshore terrestrial to intertidal to shallow marine quartz sandstone deposits. The eastern side of Dinosaur Ridge has a spectacular quartzose sandstone bedding plane with hundreds of dinosaur footprints. The tracks shown above (Caririchnium leonardii) were made by iguanodontid dinosaurs. Researchers have identified 325 dinosaur footprint at this site, made by about 37 individual dinosaurs. The sediments probably represent a tidal flat that bordered the ancient Western Interior Seaway. The track makers were principally iguanodontid dinosaurs and a small theropod dinosaur. The tracks have been stained gray with charcoal to make them easier to see - the charcoal doesn't harm the tracks. Freeze-thaw weathering is destroying the tracks, and a building over this outcrop is planned. This dinosaur tracksite is next to a modern freeway - Interstate 470. As such, the dinosaur tracksite is often called the "Cretaceous 470" or "Dinosaur Freeway". This is part of a series of dinosaur tracksites that occur along the western edge of the Western Interior Seaway and the eastern edge of the Rocky Mountains. Together, they are called the Dinosaur Freeway Megatracksite. Stratigraphy: Dakota Sandstone, Albian Stage, upper Lower Cretaceous Locality: eastern side of Dinosaur Ridge, between Interstate 70 and the town of Morrison, west of Denver, north-central Colorado, USA |
Date | |
Source | Dinosaur footprints (Dakota Sandstone, Lower Cretaceous; Dinosaur Ridge, Colorado, USA) 5 |
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@N05/22023336419 (archive). It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
1 December 2019
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current | 08:57, 1 December 2019 | 4,000 × 3,000 (4.48 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/250 sec (0.004) |
F-number | f/10 |
ISO speed rating | 80 |
Date and time of data generation | 13:48, 16 July 2015 |
Lens focal length | 9.681 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 00:42, 16 October 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:48, 16 July 2015 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 7.96875 |
APEX aperture | 6.65625 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 3.625 APEX (f/3.51) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Landscape |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 18:42, 15 October 2015 |
Unique ID of original document | B48046D1B1EC5E828F2D0E74CE17B341 |