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

Laramidia was the western half of North America during the Late Cretaceous, a long island continent that stretched from what is now Alaska to Mexico. Between roughly 100 and 66 million years ago, rising seas flooded the centre of the continent, creating the vast Western Interior Seaway, which connected the Arctic Ocean to the Gulf of Mexico and separated Laramidia from the eastern landmass of Appalachia. Isolated for millions of years, Laramidia developed its own distinctive ecosystems and some of the most diverse dinosaur faunas ever known, including tyrannosaurs, hadrosaurs, ceratopsians, and pachycephalosaurs. Many of the fossil-rich regions of western Canada, the western United States, and northern Mexico were once part of this lost continent.