File:Concretion in the Dakota Sandstone (Lower Cretaceous) (Dinosaur Ridge, Colorado, USA).jpg
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Summary
[edit]DescriptionConcretion in the Dakota Sandstone (Lower Cretaceous) (Dinosaur Ridge, Colorado, USA).jpg |
English: Concretion in structurally tilted Dakota Sandstone 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. Dinosaur tracks are common on some Dakota Sandstone bedding planes in this area. The rounded structure shown above is a concretion, which is a post-depositional structure found in some sedimentary successions. Concretions vary in mineralogy, size, and shape, but often have slightly flattened spheroidal shapes. They typically form by post-depositional mineralization around some nucleus (a rock fragment or fossil fragment). Stratigraphy: Dakota Sandstone, Albian Stage, upper Lower Cretaceous Locality: crest of Dinosaur Ridge, between Interstate 70 and the town of Morrison, west of Denver, north-central Colorado, USA |
Date | |
Source | Own work |
Author | James St. John |
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current | 00:56, 29 December 2018 | 4,000 × 3,000 (3.63 MB) | Jsj1771 (talk | contribs) | User created page with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/500 sec (0.002) |
F-number | f/4 |
ISO speed rating | 80 |
Date and time of data generation | 13:40, 16 July 2015 |
Lens focal length | 11.614 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 | 00:13, 16 October 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:40, 16 July 2015 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 8.96875 |
APEX aperture | 4 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 4 APEX (f/4) |
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 | 18:13, 15 October 2015 |
Unique ID of original document | E0B75DCF0DD785EEFD0551F41568D436 |