Scientists today announced the discovery of an extraordinarily preserved "dinosaur mummy" with much of its tissues and bones still encased in an uncollapsed envelope of skin.

Preliminary studies of the 67-million-year-old hadrosaur, named Dakota, are already altering theories of what the ancient creatures' skin looked like and how quickly they moved, project researchers say.

Further investigations may reveal detailed information about soft tissues, which could help unlock secrets about the evolution of dinosaurs and their descendents, the scientists added.

For now, the team continues to examine the rare specimen, which included preserved tendons and ligaments, and to prepare scientific articles on the find for publication.

"This specimen exceeds the jackpot," said excavation leader Phillip Manning, a paleontologist at Britain's University of Manchester