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File:Vetulonaia sp. (fossil clams) in pebbly sandstone (Morrison Formation, Upper Jurassic; Carnegie Quarry, Dinosaur National Monument, Utah, USA) 3 (48771236183).jpg

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Vetulonaia sp. - fossil freshwater bivalves in the Jurassic of Utah, USA.

The low-contrast, ~ellipsoidal structures at left in the rock are fossil freshwater clams at Dinosaur National Monument, Utah. The host rock is a pebbly sandstone - almost a conglomerate in places, but the pebbles are dominantly subangular in shape. The sandstone is most famous for its abundance of Late Jurassic dinosaur bones from sauropods, stegosaurs, and theropods. The whitish gray clasts in the photo are composed of mudrock ("mudclasts").

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: Carnegie Quarry Sandstone, Brushy Basin Member, Morrison Formation, Kimmeridgian Stage, Upper Jurassic, ~150 to 156 Ma

Locality: Carnegie Quarry, 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>
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Source Vetulonaia sp. (fossil clams) in pebbly sandstone (Morrison Formation, Upper Jurassic; Carnegie Quarry, Dinosaur National Monument, Utah, USA) 3
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@N05/48771236183. 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.

8 October 2019

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current00:38, 8 October 2019Thumbnail for version as of 00:38, 8 October 20194,288 × 2,848 (9.5 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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