Unionid bivalves (Morrison Formation, Upper Jurassic; outcrop west of Cleveland-Lloyd Dinosaur Quarry, Emery County, Utah, USA) 7 : 無料・フリー素材/写真
Unionid bivalves (Morrison Formation, Upper Jurassic; outcrop west of Cleveland-Lloyd Dinosaur Quarry, Emery County, Utah, USA) 7 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | 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 ellipsoidal structures in the talus block seen here are fossil freshwater clams at Cleveland-Lloyd Dinosaur Quarry, Utah. The host rocks in the area range from mudshales to sandstones to conglomerates. This block is composed of sandstone.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, UnionidaeStratigraphy: Morrison Formation, Kimmeridgian Stage, Upper JurassicLocality: trailside talus block 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) |
| 撮影日 | 2007-06-23 17:13:27 |
| 撮影者 | James St. John |
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