Mummufied dinosaurs happen when the animals are covered soon after their demise. Possibly one of the best was uncovered and workers are now trying to uncover its secrets.
BISMARCK, N.D. (March 18) - Using tiny brushes and chisels, workers picking at a big greenish-black rock in the basement of North Dakota's state museum http://news.aol.com/story/_a/workers-uncovering-mummified-dinosaur/20080318125409990001?ncid=NWS00010000000001