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Laramidia
Laramidia was an island continent that existed during the Late Cretaceous period (99.6–66 Ma), when the Western Interior Seaway split the continent of North America in two. In the Mesozoic era, Laramidia was an island land mass separated from Appalachia to the east by the Western Interior Seaway. The seaway eventually shrank, split across the Dakotas, and retreated towards the Gulf of Mexico and the Hudson Bay. The masses joined to unite the North American continent.
The name was coined by J. David Archibald in 1996.〔Archibald, J. David; ''Dinosaur Extinction and the End of an Era: What the Fossils Say'', New York, NY: Columbia University Press, 1996〕〔Laramidia is named for Laramie, Wyoming, located in the former landmass.〕
==Geography==
Laramidia stretches from modern-day Alaska to Mexico.〔(MSN, "Amazing Horned Dinosaurs Discovered" (23-Sep-2010) ) Accessed 23-Sep-2010.〕 The area is rich in dinosaur fossils. Tyrannosaurs, dromaeosaurids, troodontids, hadrosaurs, ceratopsians (including ''Kosmoceratops'' and ''Utahceratops''), pachycephalosaurs, and titanosaur sauropods are some of the dinosaur groups that lived on this landmass.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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