Wednesday, October 03, 2007

New hadrosaur, Gryposaurus monumentensis

A new species of Gryposaurus (Dinosauria: Hadrosauridae) from the late Campanian Kaiparowits Formation, southern Utah, USA. 2007. T.A. Gates and Ascot Sampson. Zoological Journal of the Linnean Society 151: 351–376.

Congrats to Bucky and Scott on thier new hadrosaur species (and to Mike Getty and the rest of the crew who also put their collective shoulders to the task!).


The skull was buried in sediments dating to the Late Cretaceous period—about 75 million years ago—in what is now Utahs Grand Staircase-Escalante National Monument. A team of high school students and volunteers from the Alf Museum in Claremont, California, first discovered the fossil in remote sandstone badlands in 2002.

The fossil was excavated and airlifted by helicopter from the where it was discovered and taken to the Utah Museum of Natural History at the University of Utah.

Gates and colleague Scott Sampson studied the skull, and concluded that it is a new species of hadrosaur, or duck-billed dinosaur. The species was given the scientific name Gryposaurus monumentensis in honor of the national monument where the skull was unearthed.

Download the paper for free HERE.