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Judithian
The Judithian was a North American faunal stage lasting from 83.5 to 70.6 million years ago. It overlaps with the Campanian global stage. ==Fauna== Dinosaur faunas of the Judithian age may represent the peak of dinosaur evolution in North America.〔 Hadrosaurs were universally the dominant herbivore of the period and comprised more than half of "a typical assemblage."〔 This was also the period of greatest generic diversity among large herbivorous dinosaurs.〔 Just in Montana and Southern Alberta were ten genera of ceratopsians and ten genera of hadrosaurs.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Judithian」の詳細全文を読む
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