File:Sauropod dinosaur footprint in sandstone (Morrison Formation, Upper Jurassic, western side of Dinosaur Ridge, Colorado, USA) 30.jpg
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English: Sauropod dinosaur footprint bulge in sandstone in the Jurassic of Colorado, USA.
Dinosaur Ridge is a particularly dinosaur fossil-rich section of the Dakota Hogback in north-central Colorado. It is a north-south trending ridge of eastward-dipping Mesozoic sedimentary rocks. The western side of Dinosaur Ridge (see above photo) has exposures of the Morrison Formation, an Upper Jurassic succession consisting of fluvial (river/floodplain) and lacustrine (lake) deposits, plus reddish-colored paleosol horizons. Dinosaur bones and dinosaur tracks have been found here. Seen here is a cross-section through lacustrine quartzose sandstones of the Morrison Formation. The structure in the center of the photo is a sauropod dinosaur footprint bulge. Sauropods were the largest and most massive group of dinosaurs - they had huge bodies, walked on four legs, and possessed very long tails and necks. Their great body weight resulted in significantly depressed footprints in unconsolidated sediments. Fossil bones of several different sauropod dinosaur species have been recovered from Dinosaur Ridge's Morrison Formation, making positive identification of the footprint maker shown here difficult. Known Morrison Formation sauropods in this area include (not counting junior synonyms) Atlantosaurus immanis, Apatosaurus ajax, and Camarasaurus sp. (see Mossbrucker & Bakker, 2010, pp. 10, 19, 22). Stratigraphy: Morrison Formation, Kimmeridgian Stage, middle Upper Jurassic, ~150 to 156 Ma Locality: vicinity of "Quarry 5" (= one of Arthur Lakes' dinosaur excavation sites during the Cope-Marsh Bone Wars of the late 1800s), western side of Dinosaur Ridge, between Interstate 70 and the town of Morrison, west of Denver, north-central Colorado, USA Reference cited: Mossbrucker, M.T. & R.T. Bakker. 2010. A guide to the paleontology of the Upper Jurassic Morrison Formation of Morrison, Colorado: new interpretations and discoveries. Bulletin of the Morrison Natural History Museum 1. 35 pp. |
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| Source | https://www.flickr.com/photos/47445767@N05/52566632962/ |
| 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@N05/52566632962. It was reviewed on 16 December 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 19:11, 16 December 2022 | | 3,008 × 2,000 (4.16 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52566632962/ with UploadWizard |
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