File:Dinosaur bone (Morrison Formation, Upper Jurassic; Dinosaur National Monument, Utah, USA) 45 (48839271031).jpg
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| Description |
The Upper Jurassic Morrison Formation is widely distributed in many western American states. The unit consists of fluvial (river/floodplain) and lacustrine (lake) deposits. Dinosaur bones and dinosaur tracks are moderately common in Morrison Formation sediments. Exceptionally dinosaur-rich localities include Como Bluff in Wyoming, Dinosaur National Monument in Utah, Dinosaur Ridge in Colorado, and the Cleveland-Lloyd Quarry in Utah. Seen here is a dinosaur bone in matrix at Dinosaur National Monument, Utah. The host rock ranges from a sandstone to pebbly sandstone to granulestone to almost a conglomerate, but the pebbles are dominantly angular to subangular in shape. Many granules and pebbles are composed of dark-colored chert. This horizon is famous for an abundance of Late Jurassic dinosaur bones from sauropods, stegosaurs, and theropods. Across the valley from here, the bed was intensely quarried starting in the early 1900s. Many dinosaur fossils ended up at Carnegie Museum in Pittsburgh, Pennsylvania, but many bones were also left in the rocks for the general public to examine and appreciate. The Carnegie Quarry itself has a structure built over it for protection from erosion. The dinosaur bone-bearing outcrop seen here is outdoors. Stratigraphy: Carnegie Quarry Sandstone, Brushy Basin Member, Morrison Formation, Kimmeridgian Stage, Upper Jurassic, ~150 to 156 Ma Locality: spur trail along Fossil Discovery Trail, Dinosaur National Monument, northern Uintah County, northeastern Utah, USA See info. at: <a href="https://en.wikipedia.org/wiki/Dinosaur_National_Monument" rel="noreferrer nofollow">en.wikipedia.org/wiki/Dinosaur_National_Monument</a> |
| Date | |
| Source | Dinosaur bone (Morrison Formation, Upper Jurassic; Dinosaur National Monument, Utah, USA) 45 |
| 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@N05/48839271031 (archive). It was reviewed on 8 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 00:52, 8 October 2019 | | 4,000 × 3,000 (9.5 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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