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Giant "Turkeysaurus" dinosaur found in Utah Utah Museum of Natural History April 5, 2006 New "egg-thief" dinosaur roamed the southwest Scientists from the University of Utah and the Utah Museum of Natural History have discovered the remains of a new bird-like, meat-eating dinosaur in Grand Staircase-Escalante National Monument (GSENM), southern Utah. Although represented only by the fossilized remains of hand and foot bones, comparisons with more complete skeletons found in Asia demonstrate that this animal was about seven feet tall when standing upright. Discovery of this Utah giant, which is much larger than its counterparts in Canada and the northern US, nearly doubles the documented range of these dinosaurs in North America, and demonstrates that they roamed much farther south than previously thought. A scientific paper naming and describing this animal, and published in the latest issue of the Journal of Vertebrate Paleontology, was authored by Lindsay Zanno, a graduate student in the Department of Geology and Geophysics, and Scott Sampson, chief curator at the Utah Museum of Natural History (UMNH), and associate professor in the Department of Geology and Geophysics. Ruthless Thief or Protective Parent? The most spectacular finds of oviraptorosaur dinosaurs are fossilized skeletons from the Gobi desert in Mongolia. These dinosaurs were named oviraptors, meaning "egg-thief," because their remains were discovered in close association with nests of dinosaur eggs, and it was thought that the raptors were eating the egg contents. In more recent years, however, eggs have been found with remains of baby oviraptors inside. And the adult oviraptors turn out to have been sitting on the nests, brooding the eggs just as birds do today. Thus, it appears that the adult oviraptors were protecting the embryos rather than devouring them! Nevertheless, the name has stuck. Continental Connections Oviraptorsaurs are known from a large portion of Asia but were thought to have invaded only the northern portion North America, since previous examples were known only from Montana, South Dakota, and Alberta, Canada. Discovery of Hagryphus in southern Utah demonstrates that this group of dinosaurs was much more widespread, living across much of the western United States. Hagryphus lived in a time of global warming, which melted polar caps and produced exceptionally high sea levels. As a result, the central portion of North America was flooded, isolating the eastern and western portions of the continent. The dinosaurs preserved in GSENM were stranded on the western landmass, which formed a narrow peninsula. The relationships between northern and southern dinosaurs that occupied this western landmass during the Late Cretaceous are part of a long-term research project undertaken by University of Utah scientists. A Monumental Effort Hagryphus is the first new dinosaur to be named from GSENM, and just one of many exciting finds made during a five-year collaborative project between the Monument and the University of Utah. The primary goal of this project, funded by GSENM, has been to conduct paleontological surveys and to excavate the fossils of dinosaurs and other lifeforms that existed in this region during a period near the end of the Age of Dinosaurs. More specifically, the focus of this work has been the Kaiparowits Formation, which dates to a time near the end of the Cretaceous, between 76 and 74 million years ago. Over the past five years, GSENM and University of Utah and researchers, including dozens of students and volunteers, have spent almost 17 months conducting field work within the Monument boundaries. GSENM encompasses 1.9 million acres, comprising a substantial portion of southern Utah. Sampson states that, "due to the extremely rugged nature of the terrain, this region was the last major area within the lower 48 states to be formally mapped. For the same reason, it now represents an untapped and perhaps the last major dinosaur graveyard in this country to be explored." The central region of the Monument, known as the Kaiparowits Plateau, preserves one the most complete records of Cretaceous life anywhere in the world. However, access to the remote back country must be accomplished almost entirely on foot, and fossils must either be carried out under human power or, if the specimen involves a large dinosaur skeleton, via helicopter. Thus far, project teams have prospected approximately 20,000 acres of the central Kaiparowits Plateau in the search for dinosaurs and their prehistoric contemporaries. Yet this area amounts to less than 5% of the Cretaceous, fossil-bearing rocks preserved in the Monument.
Project investigators, aided by workers at several other US institutions, are currently researching this bounty of prehistoric life forms, as well as their geologic context, in an effort to reconstruct this 75 million year old ecosystem. Project findings, including many original fossils, will be featured in an entirely new UMNH facility, scheduled to open at the end of 2009. Meanwhile, Hagryphus and many other Monument fossils can be viewed on display at the current UMNH building on Presidents Circle at the University of Utah campus, as well as in the GSENM visitor's center in Big Water, Utah. This is a modified news release from Utah Museum of Natural History News index | RSS | News Feed Advertisements: Organic Apparel from Patagonia | Insect-repelling clothing |
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