File:Grallator gracilis (dinosaur footprint) (Portland Arkose, Lower Jurassic; Rocky Hill, Connecticut, USA) (42215374551).jpg
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[edit]DescriptionGrallator gracilis (dinosaur footprint) (Portland Arkose, Lower Jurassic; Rocky Hill, Connecticut, USA) (42215374551).jpg |
Grallator gracilis (Hitchcock, 1837) - dinosaur footprint from the Jurassic of Connecticut, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA) The dinosaur that produced the footprint shown above was a theropod, a group of medium-sized to very large, bipedal, carnivorous (predatory) dinosaurs. The reddish-brown matrix is ferruginous siliciclastic sedimentary rock - it appears to be hematitic, micaceous sandstone. The sample is from the Newark Supergroup, a thick, geographically-widespread stratigraphic unit in eastern USA. It is Late Triassic to Early Jurassic in age and represents sediments and some lava flows that filled up old rift valleys that roughly parallel the Eastern Seaboard of America. The rift basins formed in the Triassic when the ancient Pangaea supercontinent attempted to break apart, but failed. A successful breakup of Pangaea occurred during the Jurassic. Most of the basin-filling rocks are terrestrial redbeds - hematite-rich siliciclastic sedimentary rocks, such as conglomerate, sandstone, siltstone, and shale, deposited in nonmarine environments. Stratigraphy: Portland Arkose, Newark Supergroup, Lower Jurassic Locality: unrecorded/undisclosed site at or near Rocky Hill, Connecticut, USA For more info., see: <a href="https://en.wikipedia.org/wiki/Grallator" rel="nofollow">en.wikipedia.org/wiki/Grallator</a> and <a href="https://en.wikipedia.org/wiki/Newark_Supergroup" rel="nofollow">en.wikipedia.org/wiki/Newark_Supergroup</a> |
Date | |
Source | Grallator gracilis (dinosaur footprint) (Portland Arkose, Lower Jurassic; Rocky Hill, Connecticut, USA) |
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@N05/42215374551 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 December 2019
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current | 04:03, 6 December 2019 | 2,083 × 2,406 (4.31 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 | 1/60 sec (0.016666666666667) |
F-number | f/11 |
ISO speed rating | 125 |
Date and time of data generation | 12:39, 24 March 2018 |
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 | 05:52, 19 May 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 12:39, 24 March 2018 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
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 | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 01:52, 19 May 2018 |
Unique ID of original document | 3A208274FF33A70D97811E2F59930A13 |