A shallow sea
North America looked very different in the past. During the time of the dinosaurs in the Late Cretaceous, North America was cut in half by a shallow, warm sea that ran from the Arctic Ocean to the Gulf of Mexico.
Map: Christopher Scotese, CC BY 4.0
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Earth as it was 90 million years ago. North America is divided in two by a shallow sea. Sea levels are much higher around the globe. The continents are in different positions, some further apart, some closer together.