nov., based upon … Discovery. Discovery. The first specimen of Allosaurus jimmadseni was discovered in the National Park Service administered by Dinosaur National Monument in Uintah County, near Vernal, Utah. On the basis of an in-depth, firsthand study of the bulk of Allosaurus specimens housed in North American institutions, we describe here a new theropod dinosaur from the Upper Jurassic Morrison Formation of Western North America, Allosaurus jimmadseni sp. The dinosaur, called Allosaurus jimmadseni, is believed to be the oldest species of Allosaurus to have existed in the Late Jurassic Period, some 157-152 million years ago. Allosaurus jimmadseni can be found in a geologic unit known as the Salt Wash Member of the Morrison Formation and its equivalents exposed in Colorado, Wyoming, and Utah. "Recognizing a new species of dinosaur in rocks that have been intensely investigated for over 150 years is an outstanding experience of discovery. Allosaurus jimmadseni can be found in a geologic unit known as the Salt Wash Member of the Morrison Formation and its equivalents exposed in Colorado, Wyoming, and Utah. Allosaurus is one of the best known theropod dinosaurs from the Jurassic and a crucial taxon in phylogenetic analyses. Allosaurus jimmadseni is named after Jim Madsen, the state’s first paleontologist who from World War II into the 1990s knew more than anyone about allosaurus and did groundbreaking research on the species, Loewen said.
Paleontologists have announced the discovery of a new species of meat-eating dinosaur in Utah. Madsen died in 2008, but his daughter, Lisa Madsen, was at Friday’s naming event in honor of her father.
The first specimen of Allosaurus jimmadseni was discovered in the National Park Service administered by Dinosaur National Monument in Uintah County, near Vernal, Utah.


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