File:Achelousaurus skull right side.jpg
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Summary
[edit]DescriptionAchelousaurus skull right side.jpg |
English: Achelousaurus horneri Sampson, 1995 - fossil ceratopsian dinosaur skull from the Cretaceous of Montana, USA. (Holotype - MOR 485, Museum of the Rockies, Bozeman, Montana, USA)
Ceratopsians are the "horned dinosaurs". They were large, quadrupedal, herbivorous dinosaurs having a beaked skull and a frill - an extension of bone behind the skull that partially covered the neck. Ceratopsian dinosaurs are known from the Jurassic and Cretaceous. The last members of the group died out at the Cretaceous-Tertiary boundary, 65 million years ago. Seen here is a partial adult skull of Achelousaurus horneri, currently only known from the Cretaceous of Montana. Rough protuberances ("bosses") are present on the snout and above the eyes. The faces of inferred younger skulls of this species were horn-bearing. The openings in the frill are called fenestra - their presence reduced the weight of the skull. Classification: Animalia, Chordata, Vertebrata, Reptilia, Archosauria, Dinosauria, Ornithischia, Marginocephalia, Ceratopsia, Ceratopsidae Stratigraphy: Two Medicine Formation, Campanian Stage, upper Upper Cretaceous Locality: undisclosed site in the Landslide Butte area, northeastern Glacier County, northwestern Montana, USA Info. at: en.wikipedia.org/wiki/Achelousaurus |
Date | |
Source | https://www.flickr.com/photos/jsjgeology/51328613860/ |
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@N05/51328613860. It was reviewed on 24 July 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
24 July 2021
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current | 14:58, 24 July 2021 | ![]() | 2,139 × 2,587 (4.19 MB) | FunkMonk (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/jsjgeology/51328613860/ with UploadWizard |
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Camera manufacturer | EASTMAN KODAK COMPANY |
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F-number | f/2.8 |
ISO speed rating | 200 |
Date and time of data generation | 14:38, 8 August 2010 |
Lens focal length | 5.85 mm |
Width | 3,648 px |
Height | 2,736 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 480 dpi |
Vertical resolution | 480 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 05:29, 22 July 2021 |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 14:38, 8 August 2010 |
Meaning of each component |
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APEX aperture | 3 |
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Color space | sRGB |
Exposure index | 200 |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Custom process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 33 mm |
Scene capture type | Standard |
Scene control | High gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Date metadata was last modified | 01:29, 22 July 2021 |
Unique ID of original document | D094BC4B95301D5CF0C099EFA4C40D2A |
IIM version | 53,248 |