An extraordinarily well-preserved 110-million-year-old dinosaur found in a mine pit in Canada now has a name and evidence of a troubled past, researchers said Thursday. With fossilized skin and scales, the dragon-like creature is actually a new kind of nodosaur, coined Borealopelta markmitchelli, after the museum technician Mark Mitchell who spent more than 7,000 hours painstakingly removing rock from around the specimen.