File:Prismatoolithus levis, troodontid dinosaur eggs, Two Medicine Formation, Upper Cretaceous; Egg Mountain, Teton County, Montana, USA.jpg
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Summary
DescriptionPrismatoolithus levis, troodontid dinosaur eggs, Two Medicine Formation, Upper Cretaceous; Egg Mountain, Teton County, Montana, USA.jpg |
English: Prismatoolithus levis Zelenitsky & Hills, 1996 - fossil dinosaur eggs from the Cretaceous of Montana, USA. (MOR 299, Museum of the Rockies, Bozeman, Montana, USA)
Biogenic products are objects produced by ancient organisms. Many paleontologists refer to these as trace fossils, but they really aren't. Examples of fossil biogenic products include eggs, amber (fossilized tree sap), coprolites (fossilized feces), and spider silk. Eggs were originally small, living cells. But hard eggshells are mineralized - the material was never alive, and thus are biogenic products. The most impressive fossil eggs are those of dinosaurs. Dinosaur nests having eggs in their original position are known from several localities. Sometimes, x-ray analysis or cat-scan analysis shows the presence of dinosaur embryos inside intact eggs. The embryos would be body fossils, but the surrounding eggshell material is a biogenic product. Seen here is a dinosaur nest with the eggs arranged obliquely upright, radiating outward from the center of the nest. The host rock is siliciclastic mudstone. The scientific name ("oospecies") for the eggs themselves is Prismatoolithus levis. They were produced by Troodon formosus, a theropod dinosaur. Classification: Animalia, Chordata, Vertebrata, Reptilia, Dinosauria, Saurischia, Theropoda, Troodontidae Stratigraphy: Two Medicine Formation, Upper Cretaceous Locality: Egg Mountain, Willow Creek Anticline, Teton County, western Montana, USA |
Date | |
Source | https://www.flickr.com/photos/jsjgeology/49779090451/ |
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@N05/49779090451. It was reviewed on 16 April 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
16 April 2020
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1 September 2008
0.01666666666666666666 second
36 millimetre
1,600
image/jpeg
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Date/Time | Dimensions | User | Comment | |
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current | 05:22, 16 April 2020 | 3,008 × 2,000 (5.82 MB) | FunkMonk | Uploaded a work by James St. John from https://www.flickr.com/photos/jsjgeology/49779090451/ with UploadWizard |
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File change date and time | 21:20, 15 April 2020 |
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Date and time of digitizing | 12:31, 1 September 2008 |
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Date metadata was last modified | 17:20, 15 April 2020 |
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