A new species of dome-headed dinosaur has been discovered in fossils found in Montana, according to researchers. The dinosaur, named Brontotholus harmoni, belongs to the family pachycephalosauridae and is believed to have lived about 75 million years ago during the Late Cretaceous period, according to a paper published earlier this month in the Zoological Journal of the Linnean Society . Five specimens now identified as B. harmoni were unearthed in the Two Medicine Formation in Glacier County, Montana, according to the paper. B. harmoni is the first pachycephalosaurid from the Late Cretaceous period to be found in the region. Pachycephalosaurids are known for its species of bi-pedal, dome-headed dinosaurs. The clade -- a group consisting of a single ancestor and all of its descendants -- i

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