File:Morrison Formation (Upper Jurassic; Dinosaur Ridge, west of Denver, Colorado, USA) 2 (22021405308).jpg
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| Description |
Shales and sandstones 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. In the outcrop shown above, the middle and lower slopes consist of mudshales, reprenting a playa lake environment. The unit at top consists of fluvial and lacustrine quartzose sandstones. Stratigraphy: Morrison Formation, Kimmeridgian Stage, middle Upper Jurassic, ~150 to 156 Ma Locality: western side of Dinosaur Ridge, near "Quarry 5" (= one of Arthur Lakes' dinosaur excavation sites during the Cope-Marsh Bone Wars of the late 1800s), between Interstate 70 and the town of Morrison, west of Denver, Colorado, USA |
| Date | |
| Source | Morrison Formation (Upper Jurassic; Dinosaur Ridge, west of Denver, Colorado, USA) 2 |
| 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@N05/22021405308 (archive). It was reviewed on 6 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 | 03:58, 6 December 2019 | | 4,000 × 3,000 (4.33 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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