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When sharks swam the Great Plains

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If you’ve ever been to, lived in, or even flown over the central swath of North America, then you’ve seen the remnants of what was a uniquely fascinating environment. Scientists call it the Western Interior Seaway, and at its greatest extent, it ran from the Caribbean Sea to the Canadian Arctic.

What was the Western Interior Seaway, and when did it exist?

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  • Video created by PBS Eons
  • Lesson Plan created by Luka Seamus Wright