File:Goniopholis sp. (fossil crocodilian jawbone) (Morrison Formation, Upper Jurassic; Dinosaur National Monument, Utah, USA) (48822634192).jpg
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Summary
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Goniopholis sp. - fossil crocodilian jawbone from the Jurassic of Utah, USA. (DNM 3047, Dinosaur National Monument, Utah, USA) The crocodylomorphs have been around since the Triassic (early Mesozoic). Some fossil crocodylomorphs reached such immense sizes that they preyed on dinosaurs. Another fossil group of reptiles, the phytosaurs (<a href="http://upload.wikimedia.org/wikipedia/commons/d/d2/Rutiodon_BW.jpg" rel="noreferrer nofollow">upload.wikimedia.org/wikipedia/commons/d/d2/Rutiodon_BW.jpg</a>), closely resemble crocodylomorphs, but are unrelated (phytosaurs are crurotarsan archosaurs). All modern and fossil crocodylomorphs have the same overall skeletal structure, although some fossils forms did depart somewhat from the stereotypical crocodile body plan (quadrupedal, dorso-ventrally compressed bodies, elongated skull & snout with eyes atop the head). So, the crocodylomorphs are, in relative terms, evolutionarily conservative. Living crocodilians are tropical to temperate, predatory semiaquatic reptiles, but fossil representatives include fully marine forms and inferred terrestrial forms. Classification: Animalia, Chordata, Vertebrata, Reptilia, Crocodylomorpha, Crocodyliformes, Neosuchia, Goniopholididae Stratigraphy: unrecorded/undisclosed member in the Morrison Formation (possibly the Carnegie Quarry Sandstone of the Brushy Basin Member), Kimmeridgian Stage, Upper Jurassic, ~150 to 156 Ma Locality: unrecorded/undisclosed site in Dinosaur National Monument (possibly the Carnegie Quarry), northern Uintah County, northeastern Utah, USA See info. at: <a href="https://en.wikipedia.org/wiki/Goniopholis" rel="noreferrer nofollow">en.wikipedia.org/wiki/Goniopholis</a> |
| Date | Taken on 9 June 2012, 13:13 |
| Source | Goniopholis sp. (fossil crocodilian jawbone) (Morrison Formation, Upper Jurassic; Dinosaur National Monument, Utah, 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@N05/48822634192 (archive). It was reviewed on 8 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:43, 8 October 2019 | | 3,756 × 1,041 (2.86 MB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
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