The new dinosaur belongs to the family Pachycephalosauridae: a group of bipedal, dome-headed herbivores known for their thick skulls and upright stance. (In Photo: Life reconstruction of Brontotholus harmoni/ Wikimedia Commons)

Researchers have identified a new species of dome-headed dinosaur from fossils unearthed in Montana. The dinosaur, named Brontotholus harmoni , was found in the Two Medicine Formation in Glacier County and is believed to have lived about 75 million years ago during the late cretaceous period, according to a study published earlier this month in the Zoological Journal of the Linnean Society .

Five specimens now attributed to B. harmoni were discovered in the area, marking the first known pachycephalosaurid species from the Late Cretaceous period to be found i

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