File:Dinosaur tracks (Dakota Sandstone, Lower Cretaceous; eastern side of Dinosaur Ridge, west of Denver, north-central Colorado, USA) (14923973613).jpg
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| Description |
Dinosaur tracksite on quartzose sandstone, Cretaceous of Colorado, USA. This impressive bedding plane has 325 dinosaur footprints, made by 37 individual dinosaurs The rocks are tidal flat quartzose sandstones, originally deposited near the shore of the ancient Western Interior Seaway. A modern highway (Interstate 470) occurs immediately east of this locality - dinosaur researchers often call this tracksite the "Cretaceous 470". The most common footprint here (= large, wide, three-toed tracks) is Caririchnium, made by an iguanodontid dinosaur. The more slender, three-toed tracks are Magnoavipes, likely made by a theropod dinosaur. The dark coloration of each footprint is not natural - they have been stained with charcoal to make them easier to see (the charcoal does not damage the tracks). Stratigraphy: Dakota Sandstone, upper Lower Cretaceous Locality: eastern side of Dinosaur Ridge, Dakota Hogback, west of Denver, north-central Colorado, USA Trace fossils are any indirect evidence of ancient life. They refer to features in rocks that do not represent parts of the body of a once-living organism. Traces include footprints, tracks, trails, burrows, borings, and bitemarks. Body fossils provide information about the morphology of ancient organisms, while trace fossils provide information about the behavior of ancient life forms. Interpreting trace fossils and determination of the identity of a trace maker can be straightforward (for example, a dinosaur footprint represents walking behavior) or not. Sediments that have trace fossils are said to be bioturbated. Burrowed textures in sedimentary rocks are referred to as bioturbation. Trace fossils have scientific names assigned to them, in the same style & manner as living organisms or body fossils. |
| Date | |
| Source | Dinosaur tracks (Dakota Sandstone, Lower Cretaceous; eastern side of Dinosaur Ridge, west of Denver, north-central Colorado, 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@N05/14923973613 (archive). It was reviewed on 1 December 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 | 09:06, 1 December 2019 | | 2,575 × 1,911 (2.22 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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