File:Dinosaur gastrolith (likely from the Morrison Formation, Upper Jurassic; western USA) 3.jpg
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| Description |
English: Dinosaur gastrolith attributed to the Morrison Formation (Upper Jurassic) of western USA.
Gastroliths are the dinosaur equivalent of gizzard stones in birds. Some birds (e.g., chickens) & some modern reptiles (e.g., crocodilians) swallow pebbles and retain them in their gizzards. The stones help to grind down food as it passes through the upper digestive tract. The rocks themselves get polished in the process. Some dinosaur skeletons have been found with concentrations of highly polished, somewhat size-sorted rocks associated with the rib cage area. These have been reasonably identified as dinosaur gizzard stones (gastroliths; a.k.a. gastric stones). Gastroliths have only been reported from the remains of sauropods, some early ceratopsians, and some ankylosaurs. The rock itself appears to be a ferruginous quartzite clast. |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50743392946/ |
| 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@N05/50743392946. It was reviewed on 21 December 2020 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 | 14:44, 21 December 2020 | | 1,712 × 2,151 (2.34 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50743392946/ with UploadWizard |
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