Utah's red rocks – world-famous attractions at numerous national parks, monuments and state parks – have yielded（生产，产出） a rare skeleton of a new species of plant-eating dinosaur that lived 185 million years ago and may have been buried alive by a collapsing sand dune（沙丘） . The discovery confirms the widespread success of sauropodomorph（蜥脚类） dinosaurs during the Early Jurassic Period（侏罗纪） . Until now, Utah's red rocks were known only for a few scattered bones and dinosaur footprints. However, discovery of a remarkably preserved partial skeleton is being published in the March 24 edition of PLoS ONE, the online open-access journal produced by the Public Library of Science.

The study was conducted by Joseph Sertich, a former University of Utah master's student and current Stony Brook University Ph.D. student, and Mark Loewen, a paleontologist（古生物学者） at the Utah Museum of Natural History and instructor in the Department of Geology（地质学） and Geophysics（地球物理学） at the University of Utah.

The new dinosaur species is named Seitaad ruessi (SAY-eet-AWD ROO-ess-EYE), which is derived from the Navajo word, "Seit'aad," a sand-desert monster from the Navajo (Diné) creation legend that swallowed its victims in sand dunes (the skeleton of Seitaad had been "swallowed" in a fossilized sand dune when it was discovered); and Ruess, after the artist, poet, naturalist and explorer Everett Ruess who mysteriously disappeared in the red rock country of southern Utah in 1934 at age 20.

Seitaad ruessi is part of a group of dinosaurs known as sauropodomorphs（蜥脚亚目） . Sauropodomorphs were distributed across the globe during the Early Jurassic, when all of the continents were still together in the supercontinent named Pangaea. Millions of years later, sauropodomorphs evolved into gigantic sauropods, long-necked plant eaters whose fossils are well known from elsewhere in Utah, including Dinosaur National Monument.