No more mammoth remains were found until 1952 when a partially fossilized mammoth tooth was discovered. The specimen weighed 3 pounds and 11 ounces while measuring in at 9.75 inches long. In the mid-to-late twentieth century, the University of Michigan sent summer expeditions into Alaska to look for Cenozoic vertebrates, but after three failed attempts they called off the effort. In 1994, a duck-billed dinosaur was discovered in a quarry being excavated in the middle Turonian Matanuska Formation for road material near the Glenn Highway, about 150 miles northeast of Anchorage. This specimen, dubbed the "Talkeetna Mountains Hadrosaur", was the first associated skeleton of an individual dinosaur in Alaska and originated within a previously unknown source of high-latitude dinosaur fossils. That same fall, paleontologists began excavating the specimen, with further work performed during the summer of 1996. It is currently housed at the University of Alaska Museum. The Talkeetna Mountains paleontologists were able to determine that the Talkeetna Mountains Hadrosaur was a juvenile about long, but the specimen did not preserve enough anatomical detail for researchers to tell if it was a hadrosaurid or lambeosaurid. Another 1994 discovery was made by a University of Alaska paleontological survey prospecting along the banks of the Colville River. The team found fossils along the river bank at the base of a bluff that was over 100 meters tall, but could not pinpoint their exact stratigraphic origin on the bluff. In 1997, D. W. Norton and a University of Alaska student named Ron Mancil traced the fossils to the top 3 meters of the bluff. From 1998 to 2002, the Museum of Nature and Science collaborated with the University of Alaska in a typical paleontological excavation of the site, which is now known as the Kikak-Tegoseak Quarry of the Prince Creek Formation. The excavation uncovered a new dinosaur bone bed predominated by the remains of an undetermined species of "Pachyrhinosaurus". The United States Army provided assistance to the researchers in 2002. The harsh local climate left the quarry's fossils in a fragmentary state, necessitating that the researchers change their approach to the excavation. After preparing a new approach, workers restarted active excavation in 2005 and stopped at the end of the 2007 field season. The material was removed from the quarry on a sling attached to a U.S. Army Bell 206 Jet Ranger. The fossils are being held at the Museum of Science and Nature.