Dinosaurs from A to Z
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Full A-Z of Dinosaurs
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Lucky Dip

While western North America formed the island continent of Laramidia, the lands east of the Western Interior Seaway became Appalachia. Isolated from the west for much of the Late Cretaceous, this eastern landmass encompassed much of what are now the Atlantic Coastal Plain, the eastern United States, and parts of eastern Canada. Its dinosaur faunas followed a different evolutionary path from those of Laramidia, producing ecosystems dominated by species rarely seen in the west. Because much of Appalachia's fossil-bearing rock is hidden beneath younger sediments or has been lost to erosion, its dinosaurs remain among the least understood in North America, offering only tantalising glimpses of a parallel world that existed on the opposite shore of the inland sea.