Genre

Valide Éteint

Abydosaurus

Chure et al. 2010

Étymologie ''Reptile d’Abydos''

Abydosaurus, qui signifie « lézard d'Abydos », est un genre fossile de dinosaures sauropodes, plus précisément un membre de la famille des brachiosauridés. Connu à partir d'un crâne et de matériel post-crânien, il a été trouvé dans des sédiments datant de l'Albien du Crétacé inférieur dans le nord-est de l'Utah, aux États-Unis. Ce genre est resté monotypique avec une seule espèce fossile connue Abydosaurus mcintoshi.

Plage temporelle

Trias

Jurassique

Crétacé

Paléogène

Néogène

252 201 145 66 0 Ma

Occurrences PBDB

Groupe

Dinosaures

Herbivore Vivant au sol, grégaire Terrestre

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Dinosaur National Monument is a United States National Monument located on the southeast flank of the Uinta Mountains on the border between Colorado and Utah at the confluence of the Green and Yampa Rivers. Although most of the monument area is in Moffat County, Colorado, the Dinosaur Quarry is located in Utah just to the north of the town of Jensen, Utah. The nearest communities are Jensen, Utah, and Dinosaur, Colorado. The park contains over 800 paleontological sites and has fossils of dinosaurs including Allosaurus, Deinonychus, Abydosaurus (a nearly complete skull, lower jaws and first four neck vertebrae of the specimen DINO 16488 found here at the base of the Mussentuchit Member of the Cedar Mountain Formation is the holotype for the description) and various long-neck, long-tail sauropods. It was declared a National Monument on October 4, 1915. The rock layer enclosing the fossils is a sandstone and conglomerate bed of alluvial or river bed origin known as the Morrison Formation from the Jurassic Period some 150 million years old. The dinosaurs and other ancient animals were carried by the river system which eventually entombed their remains in Utah. The pile of sediments were later buried and lithified into solid rock. The layers of rock were later uplifted and tilted to their present angle by the mountain building forces that formed the Uintas during the Laramide orogeny. The relentless forces of erosion exposed the layers at the surface to be found by paleontologists. The dinosaur fossil beds (bone beds) were discovered in 1909 by Earl Douglass, a paleontologist working and collecting for the Carnegie Museum of Natural History. He and his crews excavated thousands of fossils and shipped them back to the museum in Pittsburgh, Pennsylvania for study and display. President Woodrow Wilson proclaimed the dinosaur beds as Dinosaur National Monument in 1915. The monument boundaries were expanded in 1938 from the original 80-acre (320,000 m2) tract surrounding the dinosaur quarry in Utah, to its present extent of over 200,000 acres (800 km²) in Utah and Colorado, encompassing the spectacular river canyons of the Green and Yampa. Though lesser-known than the fossil beds, the petroglyphs in Dinosaur National Monument are another treasure the monument holds. Due to problems with vandals, many of the sites are not listed on area maps. The "Wall of Bones" located within the Dinosaur Quarry building in the park consists of a steeply tilted (67° from horizontal) rock layer which contains hundreds of dinosaur fossils. The enclosing rock has been chipped away to reveal the fossil bones intact for public viewing. In July 2006, the Quarry Visitor Center was closed due to structural problems that since 1957 had plagued the building because it was built on unstable clay. The decision was made to build a new facility elsewhere in the monument to house the visitor center and administrative functions, making it easier to resolve the structural problems of the quarry building while still retaining a portion of the historic Mission 66 era exhibit hall. It was announced in April 2009 that Dinosaur National Monument would receive $13.1 million to refurbish and reopen the gallery as part of the Obama administration's $750 billion stimulus plan. The Park Service successfully rebuilt the Quarry Exhibit Hall, supporting its weight on 70-foot steel micropile columns that extend to the bedrock below the unstable clay. The Dinosaur Quarry was reopened in Fall 2011. en.wikipedia.org/wiki/Dinosaur_National_Monument en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_... © Ken Lund · CC BY-SA 2.0 · Wikimedia

PBDB ↗ Wikipedia ↗

Classification

Dinosauria Clade non classé

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Saurischia Clade non classé

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Sauropodomorpha Clade non classé

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Massopoda Clade non classé

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Sauropodiformes Clade non classé

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Sauropoda Clade non classé

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Gravisauria Clade non classé

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Eusauropoda Clade non classé

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Neosauropoda Clade non classé

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Macronaria Clade non classé

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Titanosauriformes Clade non classé

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Brachiosauridae Famille

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Abydosaurus Genre

Sites de découverte 1 sites géolocalisés

Répartition

Principaux pays

🇺🇸 États-Unis

Formations géologiques

Cedar Mountain

Distribution temporelle

Cénomanien (100.5–93.9 Ma)

Espèces (1)

Abydosaurus mcintoshi 101 Ma

Images 1

Bibliographie

Description originale

D. J. Chure, B. B. Britt, and J. A. Whitlock, J. A. Wilson. 2010. First complete sauropod dinosaur skull from the Cretaceous of the Americas and the evolution of sauropod dentition. Naturwissenschaften DOI ↗

Bibliographie (1)

Abydosaurus

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