File:Unionid bivalves (Morrison Formation, Upper Jurassic; outcrop west of Cleveland-Lloyd Dinosaur Quarry, Emery County, Utah, USA) 14.jpg
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English: Fossil bivalves in the Jurassic of Utah, USA.
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. The irregularly-ellipsoidal structures on the base of this sandstone unit are fossil freshwater clams at Cleveland-Lloyd Dinosaur Quarry, Utah. The clams do not have their shells preserved - they are internal molds. Molds are a common type of fossil preservation style, consisting of impressions of the exterior or interior surfaces of hard part shells or skeletons. Classification: Animalia, Mollusca, Bivalvia, Paleoheterodonta, Unionida, Unionidae Stratigraphy: Morrison Formation, Kimmeridgian Stage, Upper Jurassic Locality: trailside outcrop just west of the Cleveland-Lloyd Dinosaur Quarry, Emery County, Utah, USA (vicinity of 39° 19' 25.52" North latitude, 110° 41' 19.86" West longitude) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/49845375422/ |
| 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@N05/49845375422. It was reviewed on 14 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 03:56, 14 October 2020 | | 3,008 × 2,000 (4.05 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49845375422/ with UploadWizard |
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